Biology Quiz: Muscular System Trivia Questions

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Biology Quiz: Muscular System Trivia Questions - Quiz

Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. The muscular system helps in stabilizing our joins, maintain a posture and generate heat during activity. Test out how much of chapter 9 on the muscular system you understood.


Questions and Answers
  • 1. 

    Which of the following muscles is described as striated and INvoluntary

    • A.

      Aponeurosis

    • B.

      Smooth

    • C.

      Skeletal

    • D.

      Cardiac

    Correct Answer
    D. Cardiac
    Explanation
    Cardiac muscle is described as striated and involuntary. Striated muscles have a striped appearance due to the arrangement of their contractile proteins. Cardiac muscle is found in the walls of the heart and is responsible for pumping blood throughout the body. Unlike skeletal muscles, which are under voluntary control, cardiac muscle contracts involuntarily, meaning it functions without conscious control. This allows the heart to beat rhythmically and continuously, ensuring the circulation of blood. Smooth muscle, on the other hand, is also involuntary but lacks striations, while skeletal muscle is striated but under voluntary control.

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  • 2. 

    Actin is

    • A.

      Located within the NMJ

    • B.

      A contractile protein that is called a thin filament

    • C.

      Called a thick filament

    • D.

      Stored within the sarcoplasmic reticulum

    Correct Answer
    B. A contractile protein that is called a thin filament
    Explanation
    Actin is a contractile protein that is called a thin filament. Actin is a crucial component of muscle fibers and is responsible for their contraction. It works together with another protein called myosin, which forms the thick filaments. When actin and myosin interact, they generate the force required for muscle contraction. Therefore, actin plays a vital role in the movement and functioning of muscles.

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  • 3. 

    Which of the following forms cross-bridges with actin?

    • A.

      Sarcoplasmic reticulum

    • B.

      T Tubules

    • C.

      Myosin

    • D.

      Sarcolemma

    Correct Answer
    C. Myosin
    Explanation
    Myosin is the correct answer because it is the protein responsible for forming cross-bridges with actin. Cross-bridges are formed during muscle contraction when myosin heads attach to actin filaments and pull them closer together, resulting in muscle contraction. The sarcoplasmic reticulum is responsible for storing and releasing calcium ions, which are necessary for muscle contraction. T tubules are invaginations of the sarcolemma that help transmit the electrical signals for muscle contraction. The sarcolemma is the cell membrane of muscle fibers.

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  • 4. 

    Which one do you like?

    • A.

      Option 1

    • B.

      Option 2

    • C.

      Option 3

    • D.

      Option 4

    Correct Answer
    A. Option 1
  • 5. 

    "Pumping Iron" is most likely to cause

    • A.

      Hypertrophy

    • B.

      Atrophy

    • C.

      Muscular dystrophy

    • D.

      Contracture formation

    Correct Answer
    A. Hypertrophy
    Explanation
    The correct answer is Hypertrophy. "Pumping Iron" refers to weightlifting or strength training exercises, which are known to stimulate muscle growth and increase muscle size. Hypertrophy is the process of muscle cells enlarging in response to increased workload, such as resistance training. This is achieved through an increase in protein synthesis and an increase in the size of muscle fibers. Therefore, "Pumping Iron" is most likely to cause hypertrophy, not atrophy (muscle wasting), muscular dystrophy (a genetic disorder causing muscle weakness), or contracture formation (permanent shortening of muscle or joint).

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  • 6. 

    The orbicularis oris muscle

    • A.

      Surrounds the mouth

    • B.

      Flexs the head

    • C.

      Is the smiling muscle

    • D.

      Closes the eye

    Correct Answer
    A. Surrounds the mouth
    Explanation
    The correct answer is "Surrounds the mouth." The orbicularis oris muscle is a circular muscle that surrounds the mouth. It is responsible for closing and puckering the lips, allowing us to form different facial expressions and perform actions like speaking, eating, and kissing. It helps in controlling the movement and shape of the mouth, making it an essential muscle for various functions related to the oral cavity.

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  • 7. 

    Which of the following is not a facial muscle

    • A.

      Orbicularis oculi

    • B.

      Zygomaticus

    • C.

      Sternocleidomastoid

    • D.

      Frontalis

    Correct Answer
    C. Sternocleidomastoid
    Explanation
    The sternocleidomastoid is not a facial muscle, but rather a muscle located in the neck. It is responsible for rotating and flexing the head. In contrast, the orbicularis oculi is a facial muscle that controls the closing and blinking of the eyes, the zygomaticus is a facial muscle involved in smiling, and the frontalis is a facial muscle responsible for raising the eyebrows and wrinkling the forehead.

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  • 8. 

    Which muscle is located on the posterior area of the body?

    • A.

      Latissimus dorsi

    • B.

      Pectoralis major

    • C.

      Quadriceps femoris

    • D.

      Sternocleidomastoid

    Correct Answer
    A. Latissimus dorsi
    Explanation
    The correct answer is Latissimus dorsi. The latissimus dorsi is a large muscle located on the posterior area of the body. It is a broad, flat muscle that extends from the lower back up to the armpit. It is responsible for several movements of the upper body, including pulling the arms down and back, as well as rotating the shoulders.

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  • 9. 

    Which group is muscles is located on the posterior thigh?

    • A.

      Rotator cuff muscles

    • B.

      Quadriceps

    • C.

      Hamstrings

    • D.

      Muscles of mastication

    Correct Answer
    C. Hamstrings
    Explanation
    The correct answer is hamstrings. The hamstrings are a group of muscles located on the posterior thigh. They consist of three muscles: the biceps femoris, semitendinosus, and semimembranosus. These muscles are responsible for flexing the knee and extending the hip. They play a crucial role in activities such as running, jumping, and bending the knee.

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  • 10. 

    The biceps femoris, semitendinosus and semimembranosus

    • A.

      Flex the foot

    • B.

      Attach to the patella

    • C.

      Are the hamstrings

    • D.

      Are located on the anterior thigh

    Correct Answer
    C. Are the hamstrings
    Explanation
    The biceps femoris, semitendinosus, and semimembranosus are the three muscles that make up the hamstring group. These muscles are located on the posterior thigh and are responsible for flexing the knee joint. They play a crucial role in activities such as running, jumping, and bending the knee.

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  • 11. 

    The rectus femoris, vastus lateralis, vastus medialis and vastus intermedius

    • A.

      Insert on the calcaneus

    • B.

      Flex the leg at the knee

    • C.

      Are antagonistic to the quadriceps femoris

    • D.

      Are the muscles of the quadriceps femoris

    Correct Answer
    D. Are the muscles of the quadriceps femoris
    Explanation
    The rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius are the muscles of the quadriceps femoris. These muscles are located in the front of the thigh and work together to extend the leg at the knee joint. They are responsible for movements such as kicking, jumping, and running.

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  • 12. 

    Which flat muscle covers the forehead and raises the eyebrows (for a "suprised" look)?

    • A.

      Frontalis

    • B.

      Zygomaticus

    • C.

      Masseter

    • D.

      Buccinator

    Correct Answer
    A. Frontalis
    Explanation
    The correct answer is Frontalis. The frontalis is a flat muscle that covers the forehead and is responsible for raising the eyebrows, giving a "surprised" look. It is one of the muscles involved in facial expressions and is innervated by the facial nerve. The zygomaticus is a muscle that controls smiling, the masseter is a muscle involved in chewing, and the buccinator is a muscle that helps with blowing and sucking actions.

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  • 13. 

    The levator palpebrae superioris

    • A.

      Purses the lips

    • B.

      Allows one to whistle

    • C.

      Raises the eyelids

    • D.

      Wiggles the nose

    Correct Answer
    C. Raises the eyelids
    Explanation
    The levator palpebrae superioris is a muscle responsible for raising the eyelids. When this muscle contracts, it pulls the upper eyelid upwards, allowing the eyes to open. This action is essential for maintaining proper vision and protecting the eyes from external elements. The other options mentioned, such as pursing the lips, whistling, and wiggling the nose, are unrelated to the levator palpebrae superioris muscle and do not involve the movement of the eyelids.

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  • 14. 

    The smiling muscle is the

    • A.

      Buccinator

    • B.

      Zygomaticus

    • C.

      Frontalis

    • D.

      Orbicularis oris

    Correct Answer
    B. Zygomaticus
    Explanation
    The zygomaticus muscle is responsible for smiling. It is a facial muscle that extends from the cheekbone to the corner of the mouth. When this muscle contracts, it pulls the corners of the mouth upward, creating a smile. The other options listed are also facial muscles, but they are not specifically associated with smiling. The buccinator muscle is involved in chewing and the movement of the cheeks, the frontalis muscle is responsible for raising the eyebrows, and the orbicularis oris muscle is involved in puckering the lips.

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  • 15. 

    Which muscles are located between the ribs and help move the rib cage during breathing

    • A.

      Diaphragm

    • B.

      Sternocleidomastoid

    • C.

      Serratus anterior

    • D.

      Intercostal muscles

    Correct Answer
    D. Intercostal muscles
    Explanation
    The intercostal muscles are located between the ribs and help move the rib cage during breathing. They play a crucial role in expanding and contracting the chest cavity, allowing for the inhalation and exhalation of air. When the intercostal muscles contract, they lift the rib cage, increasing the volume of the chest cavity and allowing air to enter the lungs. When they relax, the rib cage lowers, decreasing the volume of the chest cavity and forcing air out of the lungs. Therefore, the intercostal muscles are essential for the process of breathing.

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  • 16. 

    Which muscle is located in the lower extremities

    • A.

      Peroneus longus

    • B.

      Latissimus dorsi

    • C.

      Serratus anterior

    • D.

      Perctoralis major

    Correct Answer
    A. Peroneus longus
    Explanation
    The muscle located in the lower extremities is the Peroneus longus. This muscle is located on the lateral side of the lower leg and runs from the lateral condyle of the tibia to the base of the first metatarsal and medial cuneiform bones. It plays a role in ankle stabilization, eversion of the foot, and helps to maintain balance during walking and running. The other options, latissimus dorsi, serratus anterior, and pectoralis major, are muscles located in the upper body, not in the lower extremities.

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  • 17. 

    Which group muscles move the arms at the shoulder

    • A.

      Quadriceps femoris group

    • B.

      Hamstrings

    • C.

      Rotator cuff muscles

    • D.

      Muscle of mastication

    Correct Answer
    C. Rotator cuff muscles
    Explanation
    The rotator cuff muscles are responsible for moving the arms at the shoulder. These muscles, including the supraspinatus, infraspinatus, teres minor, and subscapularis, work together to stabilize and rotate the shoulder joint. They play a crucial role in various arm movements, such as lifting, reaching, and throwing. The quadriceps femoris group and hamstrings are muscles in the thigh that primarily move the leg at the knee joint, while the muscles of mastication are involved in chewing and moving the jaw.

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  • 18. 

    The brachialis and brachiordialis

    • A.

      Flex the forearm at the elbow

    • B.

      Extend the hand

    • C.

      Are antagonistic to the biceps brachii

    • D.

      Shrug the shoulders

    Correct Answer
    A. Flex the forearm at the elbow
    Explanation
    The brachialis and brachioradialis muscles are responsible for flexing the forearm at the elbow joint. When these muscles contract, they cause the forearm to bend towards the upper arm. This action is important for movements such as bringing the hand closer to the shoulder or lifting objects towards the body. The brachialis and brachioradialis work in conjunction with other muscles, such as the biceps brachii, to perform these movements effectively.

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  • 19. 

    Which large muscle extends the thigh at the hip

    • A.

      Sartorius

    • B.

      Hamstring

    • C.

      Rotator cuff

    • D.

      Latissimus dorsi

    Correct Answer
    B. Hamstring
    Explanation
    The hamstring muscle is responsible for extending the thigh at the hip. It is a large muscle located at the back of the thigh and consists of three separate muscles: the biceps femoris, semitendinosus, and semimembranosus. When these muscles contract, they work together to extend the thigh, allowing for movements such as kicking, running, and walking. The other options, sartorius, rotator cuff, and latissimus dorsi, are not directly involved in extending the thigh at the hip.

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  • 20. 

    Which muscle attaches to the cranial aponeurosis and wrinkles the forehead?

    • A.

      Frontalis

    • B.

      Buccinator

    • C.

      Orbicularis Oculi

    • D.

      Platysma

    Correct Answer
    A. Frontalis
    Explanation
    The muscle that attaches to the cranial aponeurosis and wrinkles the forehead is the Frontalis muscle. This muscle is responsible for raising the eyebrows and creating horizontal wrinkles on the forehead. It is located on the front of the head and is one of the muscles involved in facial expressions.

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  • 21. 

    "Make like a scarecrow" by contracting which muscle?

    • A.

      Frontalis

    • B.

      Trapezius

    • C.

      Latissimus Dorsi

    • D.

      Deltoid

    Correct Answer
    D. Deltoid
    Explanation
    The deltoid muscle is responsible for the movement of the arm and shoulder. When someone "makes like a scarecrow," they typically extend their arms out to the sides, resembling the position of a scarecrow. This movement requires the contraction of the deltoid muscle to lift and hold the arms in that position. Therefore, the correct answer is Deltoid.

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  • 22. 

    Which muscle lies along the anterior surface of the humerus and acts synergistically with the branchialis and brachioradialis to flex the forearm at the elbow?

    • A.

      Deltoid

    • B.

      Triceps Brachii

    • C.

      Biceps Brachii

    • D.

      Latissimus Dorsi

    Correct Answer
    C. Biceps Brachii
    Explanation
    The biceps brachii muscle lies along the anterior surface of the humerus and works together with the branchialis and brachioradialis muscles to flex the forearm at the elbow. The deltoid muscle is located on the shoulder and is responsible for shoulder abduction. The triceps brachii muscle is located on the posterior surface of the humerus and is responsible for extending the forearm at the elbow. The latissimus dorsi muscle is located on the back and is responsible for shoulder adduction and extension.

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  • 23. 

    The gastrocnemius and the soleus are commonly called the

    • A.

      Swimmers muscles

    • B.

      Toe dancers muscles

    • C.

      Muscles of mastication

    • D.

      Trumpeters muscles

    Correct Answer
    B. Toe dancers muscles
    Explanation
    The gastrocnemius and the soleus muscles are commonly referred to as the "toe dancers muscles" because they play a crucial role in the movements required for ballet and other forms of dance that involve dancing on the toes. These muscles are responsible for plantar flexion of the foot, which allows dancers to rise up onto their toes and perform movements such as releve and en pointe. The strength and flexibility of these muscles are essential for dancers to maintain balance and perform intricate footwork.

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  • 24. 

    What is the name of the cord of connective tissue that connects muscle to bone

    • A.

      Ligament

    • B.

      Tendon

    • C.

      Linea Alba

    • D.

      Aponeurosis

    Correct Answer
    B. Tendon
    Explanation
    A tendon is the correct answer because it is the cord of connective tissue that connects muscle to bone. Ligaments, on the other hand, connect bone to bone. Linea Alba is a fibrous structure in the midline of the abdomen, and Aponeurosis is a sheet-like tendon. Therefore, the correct answer is tendon.

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  • 25. 

    Which of the following is a series of contractile units that make up each myofibril (each unit extends from the Z line to the Z line)?

    • A.

      Sarcomeres

    • B.

      Synapses

    • C.

      Fascicles

    • D.

      Sarcoplasmic reticulum

    Correct Answer
    A. Sarcomeres
    Explanation
    Sarcomeres are the correct answer because they are the contractile units that make up each myofibril. Each sarcomere extends from the Z line to the Z line and is responsible for muscle contraction. Synapses are junctions between nerve cells, fascicles are bundles of muscle fibers, and sarcoplasmic reticulum is a specialized type of endoplasmic reticulum found in muscle cells.

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  • 26. 

    Which structure is an extension of the sarcolemma or cell membrane, which penetrates the interior of the muscle and carries the electrical signal to the deepest part of the muscle

    • A.

      Sarcoplasmic Reticulum

    • B.

      T Tubule

    • C.

      Z Line

    • D.

      Tendon

    Correct Answer
    B. T Tubule
    Explanation
    The T tubule is an extension of the sarcolemma or cell membrane that penetrates the interior of the muscle. It carries the electrical signal, known as an action potential, to the deepest part of the muscle. This allows for the coordinated contraction of muscle fibers. The sarcoplasmic reticulum, on the other hand, is a specialized type of smooth endoplasmic reticulum that stores and releases calcium ions, which are necessary for muscle contraction. The Z line is a structure that anchors the thin filaments in a muscle fiber. The tendon is a tough band of connective tissue that connects muscle to bone.

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  • 27. 

    The sarcoplasmis reticulum

    • A.

      Stores ACh

    • B.

      Is located within the NMJ

    • C.

      Envelops the sarcomere-containing myofibrils

    • D.

      Is contractile protein

    Correct Answer
    C. Envelops the sarcomere-containing myofibrils
    Explanation
    The sarcoplasmic reticulum is a specialized organelle found in muscle cells that plays a crucial role in muscle contraction. It is responsible for storing and releasing calcium ions, which are necessary for muscle contraction. The sarcoplasmic reticulum surrounds and envelops the sarcomere-containing myofibrils, which are the contractile units of muscle cells. This arrangement allows for efficient and coordinated muscle contraction by ensuring that the calcium ions are released in the appropriate location, leading to the sliding of the myofibrils and muscle contraction.

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  • 28. 

    Which is the site of calcium storage in a relaxed skeletal muscle?

    • A.

      T Tubule

    • B.

      NMJ

    • C.

      Fascicile

    • D.

      Sarcoplasmic reticulum

    Correct Answer
    D. Sarcoplasmic reticulum
    Explanation
    The sarcoplasmic reticulum is the site of calcium storage in a relaxed skeletal muscle. It is a specialized type of endoplasmic reticulum found in muscle cells. Calcium ions are stored within the sarcoplasmic reticulum and are released when a muscle is stimulated to contract. This release of calcium ions triggers a series of events that lead to muscle contraction. Therefore, the sarcoplasmic reticulum plays a crucial role in the regulation of muscle contraction and relaxation.

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  • 29. 

    Acetylcholine is released from the prejunctional membrane in response to the

    • A.

      Nerve impulse

    • B.

      Binding the myosin heads to actin

    • C.

      Release of calcium from the sarcoplasmic reticulum

    • D.

      Inactivation of acetylcholinesterase

    Correct Answer
    A. Nerve impulse
    Explanation
    Acetylcholine is a neurotransmitter that is released from the prejunctional membrane in response to a nerve impulse. Nerve impulses are electrical signals that travel along the nerve fibers, allowing for communication between neurons. When a nerve impulse reaches the prejunctional membrane, it triggers the release of acetylcholine into the synaptic cleft. Acetylcholine then binds to receptors on the postjunctional membrane, leading to various physiological responses such as muscle contraction. Therefore, the correct answer is nerve impulse.

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  • 30. 

    Which of the following is responsible for muscle relaxation?

    • A.

      The sarcomere runs out of ATP

    • B.

      Calcium floods the area of the sarcomere, allowing for the interaction of actin and myosin

    • C.

      Calcium is pumped back into the sarcoplasmic reticulum

    • D.

      Acetylcholinsterase in the NMJ is depleted

    Correct Answer
    C. Calcium is pumped back into the sarcoplasmic reticulum
    Explanation
    When a muscle contracts, calcium ions are released into the sarcomere, allowing the interaction between actin and myosin which causes muscle contraction. However, for muscle relaxation to occur, the calcium ions need to be removed from the sarcomere. This is done by actively pumping the calcium back into the sarcoplasmic reticulum, a specialized structure within the muscle cell. Once the calcium is pumped back into the sarcoplasmic reticulum, the interaction between actin and myosin is disrupted, leading to muscle relaxation. Therefore, the correct answer is that calcium is pumped back into the sarcoplasmic reticulum.

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  • 31. 

    Which of the following describes a muscle that remains in a contracted state

    • A.

      Twitch

    • B.

      Tetany

    • C.

      Atrophy

    • D.

      Hypertrophy

    Correct Answer
    B. Tetany
    Explanation
    Tetany refers to a muscle that remains in a contracted state. It is characterized by prolonged, involuntary muscle contractions due to abnormal nerve activity. This condition can cause muscle stiffness, cramps, and spasms. Unlike a twitch, which is a brief and involuntary muscle contraction, tetany involves sustained muscle contractions. Atrophy refers to the wasting away or shrinking of muscles, while hypertrophy refers to the enlargement or growth of muscles.

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  • 32. 

    Joey has had his leg in a non-weight bearing cast for 8 weeks. When the cast is removed the legs appears smaller than the uninjured leg. Which term best describes this observation?

    • A.

      Contracture

    • B.

      Hypertrophy

    • C.

      Muscle Dystrophy

    • D.

      Disuse Atrophy

    Correct Answer
    D. Disuse Atrophy
    Explanation
    Disuse atrophy is the best term to describe the observation that Joey's leg appears smaller than the uninjured leg after the cast is removed. Disuse atrophy refers to the wasting away or loss of muscle mass that occurs when a muscle is not used or immobilized for an extended period of time, such as being in a non-weight bearing cast for 8 weeks. This lack of use leads to a decrease in muscle size and strength, resulting in the observed smaller appearance of the leg.

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  • 33. 

    Which muscle cover the shoulder like a shoulder pad?

    • A.

      Deltoid

    • B.

      Trapezius

    • C.

      Biceps Brachii

    • D.

      Sternocleidomastoid

    Correct Answer
    A. Deltoid
    Explanation
    The deltoid muscle covers the shoulder like a shoulder pad. It is a large, triangular muscle that forms the rounded contour of the shoulder. The deltoid muscle is responsible for various movements of the arm, including lifting the arm to the side and lifting the arm to the front. Its shape and location make it resemble a shoulder pad, providing support and protection to the shoulder joint.

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  • 34. 

    Which of the following "Muscle words" refers to the chest?

    • A.

      Rectus

    • B.

      Latissimus

    • C.

      Vastus

    • D.

      Pectoralis

    Correct Answer
    D. Pectoralis
    Explanation
    The muscle word that refers to the chest is "pectoralis". This muscle is located in the chest area and is responsible for movements such as flexion, adduction, and medial rotation of the arm.

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  • 35. 

    Which muscle is located in the upper back and posterior neck region, contraction of this muscle causes you to look up to the sky? 

    • A.

      Pectoralis major

    • B.

      Sternocleidomastoid

    • C.

      Trapezius

    • D.

      Diaphragm

    Correct Answer
    C. Trapezius
    Explanation
    The trapezius muscle is located in the upper back and posterior neck region. Contraction of this muscle causes you to look up to the sky. The pectoralis major is a muscle in the chest area and is not responsible for looking up. The sternocleidomastoid muscle is located in the neck but is responsible for rotating the head, not looking up. The diaphragm is a muscle located below the lungs and is responsible for breathing, not looking up. Therefore, the correct answer is trapezius.

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  • 36. 

    Which muscle separates the thoracic and abdominal cavities and is also the chief breathing muscle?

    • A.

      Serratus anterior

    • B.

      Intercostal muscle

    • C.

      Sternocleidomastoid

    • D.

      Diaphragm

    Correct Answer
    D. Diaphragm
    Explanation
    The diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities. It plays a crucial role in breathing as it contracts and relaxes to create changes in thoracic pressure, allowing air to enter and exit the lungs. As the chief breathing muscle, the diaphragm is responsible for the majority of the work involved in the process of inhalation and exhalation.

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  • 37. 

    Which muscle are you using as you turn your head to the left and then to the right? 

    • A.

      Sternocleidomastoid

    • B.

      Frontalis

    • C.

      Pectoralis major

    • D.

      Diaphragm

    Correct Answer
    A. Sternocleidomastoid
    Explanation
    The sternocleidomastoid muscle is responsible for turning the head to the left and right. It is a long muscle located on the side of the neck, and when contracted on one side, it causes the head to rotate towards the opposite side. This muscle plays a crucial role in various movements of the head and neck, including turning and tilting the head. The other options listed (frontalis, pectoralis major, and diaphragm) are not involved in the specific movement of turning the head.

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  • 38. 

    Which muscles are located on the inner (medial) surface of the thigh and move the thigh toward the midline of the body

    • A.

      Gastrocnemius

    • B.

      Quadriceps femoris

    • C.

      Adductors

    • D.

      Sartorius

    Correct Answer
    C. Adductors
    Explanation
    The adductors are the muscles located on the inner (medial) surface of the thigh that move the thigh toward the midline of the body. These muscles play a crucial role in movements such as bringing the legs together and crossing one leg over the other. The gastrocnemius is a muscle located in the calf, not the thigh. The quadriceps femoris is a group of muscles that extend the leg at the knee joint. The sartorius is a long, thin muscle that runs diagonally across the front of the thigh and helps with flexion, abduction, and external rotation of the hip joint.

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  • 39. 

    Where is the vastus lateralis located?

    • A.

      Arm

    • B.

      Thigh

    • C.

      Chest

    • D.

      Back

    Correct Answer
    B. Thigh
    Explanation
    The vastus lateralis is located in the thigh. It is one of the four muscles that make up the quadriceps muscle group in the front of the thigh. The vastus lateralis is the largest and most powerful muscle of the quadriceps, and it plays a key role in extending the knee joint.

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  • 40. 

    What is the function of the masseter muscle?

    • A.

      Adducts the thigh

    • B.

      Chews food

    • C.

      Lifts the eyelid

    • D.

      Flexes the forearm at the elbow

    Correct Answer
    B. Chews food
    Explanation
    The masseter muscle is responsible for chewing food. It is a powerful muscle located in the jaw that helps in the movement of the mandible during the process of mastication. When the masseter muscle contracts, it brings the lower jaw up towards the upper jaw, allowing the teeth to come together and grind food into smaller pieces, making it easier to swallow and digest. This muscle is essential for the proper functioning of the jaw and the process of eating.

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  • 41. 

    The Achilles Tendon attaches the soleus and which muscle to the calcaneus?

    • A.

      Sartorius

    • B.

      Quadriceps femoris

    • C.

      Gastrocnemius

    • D.

      Vastus lateralis

    Correct Answer
    C. Gastrocnemius
    Explanation
    The Achilles tendon attaches the soleus and the gastrocnemius muscle to the calcaneus.

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  • 42. 

    On which large muscle do you sit?

    • A.

      Latissimus dorsi

    • B.

      Gastrocnemius

    • C.

      Gluteus maximus

    • D.

      Rectus femoris

    Correct Answer
    C. Gluteus maximus
    Explanation
    The gluteus maximus is the correct answer because it is the largest muscle in the body and is responsible for the majority of the buttock's shape and structure. It is the muscle that you sit on when you are sitting down. The latissimus dorsi is a large muscle in the back, the gastrocnemius is a muscle in the calf, and the rectus femoris is a muscle in the thigh.

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  • 43. 

    The rectus, transversus, internal oblique and the external oblique refer to

    • A.

      Smooth muscle

    • B.

      Abdominal muscles

    • C.

      Breathing muscles

    • D.

      Muscles that are located on the back and work synergistically with the latissimus dorsi

    Correct Answer
    B. Abdominal muscles
    Explanation
    The rectus, transversus, internal oblique, and external oblique are all muscles that are located in the abdomen. These muscles play a crucial role in providing stability and support to the core, as well as aiding in movements such as bending, twisting, and maintaining posture. They are commonly referred to as the abdominal muscles.

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  • 44. 

    Which muscle lies along the posterior surface of the arm; it extends the forearm and is used to bear weight in crutch walking

    • A.

      Biceps brachii

    • B.

      Biceps femoris

    • C.

      Deltoid

    • D.

      Triceps brachii

    Correct Answer
    D. Triceps brachii
    Explanation
    The triceps brachii muscle is located along the posterior surface of the arm. It is responsible for extending the forearm, which means it straightens the arm at the elbow joint. Additionally, it plays a role in supporting weight during crutch walking. The biceps brachii muscle, on the other hand, is located on the anterior surface of the arm and is responsible for flexing the forearm. The biceps femoris is a muscle located in the posterior thigh, while the deltoid is a muscle located in the shoulder.

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  • 45. 

    Which of the following increases the force of contraction of a whole muscle?

    • A.

      Twitch

    • B.

      Contracture

    • C.

      Ossification

    • D.

      Recruitment

    Correct Answer
    D. Recruitment
    Explanation
    Recruitment refers to the process of activating additional motor units within a muscle to generate a stronger contraction. By recruiting more motor units, the muscle can generate a greater force of contraction. This is achieved by the nervous system sending signals to activate more motor neurons, which in turn stimulate more muscle fibers to contract. Therefore, recruitment increases the force of contraction of a whole muscle.

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  • 46. 

    The force of muscle contraction is most related to the

    • A.

      Amount of calcium that is stored within the sarcoplasmic reticulum

    • B.

      Amount of neurotransmitter releases from the prejunctional vesicles

    • C.

      Numbers of cross-bridges formed between the actin & myosin

    • D.

      Size of the somatic motor neuron

    Correct Answer
    C. Numbers of cross-bridges formed between the actin & myosin
    Explanation
    The force of muscle contraction is most related to the number of cross-bridges formed between the actin and myosin. Cross-bridges are formed when myosin heads attach to actin filaments, causing them to slide past each other and generate force. The more cross-bridges that are formed, the greater the force of contraction. This is why factors such as muscle fiber recruitment and muscle fiber type can affect the force of contraction, as they can influence the number of cross-bridges that are formed.

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  • 47. 

    With regard to skeletal muscle contraction, which event comes first?

    • A.

      Cross-bridge formation between the actin and myosin

    • B.

      Release of calcium from the sarcoplasmic reticulum

    • C.

      Activation of the NM receptor within the neuromuscular junction

    • D.

      Release of the neurotransmitter(ACH) from the somatic motor neuron

    Correct Answer
    D. Release of the neurotransmitter(ACH) from the somatic motor neuron
    Explanation
    The release of the neurotransmitter (ACH) from the somatic motor neuron comes first in skeletal muscle contraction. This neurotransmitter is released at the neuromuscular junction and binds to the NM receptor, activating it. This activation then triggers the release of calcium from the sarcoplasmic reticulum, which allows for cross-bridge formation between actin and myosin. Therefore, the release of ACH is the initial event that sets off the cascade of events leading to muscle contraction.

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  • 48. 

    With regard to the skeletal muscle contraction, which event comes last? 

    • A.

      Shortening of the sarcomere

    • B.

      Release of calcium from the sarcoplasmic reticulum

    • C.

      Activation of the NM receptors by AcH

    • D.

      Release of neurostransmitter (Ach) from the somatic motor neuron

    Correct Answer
    A. Shortening of the sarcomere
    Explanation
    Shortening of the sarcomere is the final event in skeletal muscle contraction. The sarcomere is the basic unit of muscle contraction, and when it shortens, it causes the muscle to contract. Before the sarcomere can shorten, several other events must occur. First, the release of calcium from the sarcoplasmic reticulum triggers muscle contraction. This calcium binds to troponin, allowing myosin and actin to interact and generate force. Next, the activation of the NM receptors by AcH allows for the propagation of the action potential along the muscle fiber. Finally, the release of neurotransmitter (Ach) from the somatic motor neuron initiates the muscle contraction process.

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  • 49. 

    Which group is incorrect?

    • A.

      Dysfunction at the NMJ, botulism and myasthenia gravis

    • B.

      Contractile proteins; thin filaments, myosin, aponeurosis

    • C.

      Terms that describe the muscle activity of a whole muscle; twitch and tetany

    • D.

      Movements; flexion, supination and abduction

    Correct Answer
    B. Contractile proteins; thin filaments, myosin, aponeurosis
    Explanation
    The group that is incorrect is "Contractile proteins; thin filaments, myosin, aponeurosis." This is because aponeurosis is not a contractile protein, but rather a sheet-like tendon that connects muscles to bones or other muscles. Contractile proteins include actin (thin filaments) and myosin, which are responsible for muscle contraction.

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  • 50. 

    Which group is incorrect?

    • A.

      Types of striated muscle; skeletal, cardiac, smooth

    • B.

      Movements; extension, pronation, adduction

    • C.

      Movements; flexion, supination, abduction

    • D.

      Muscles of the face; frontalis, buccinator, masseter

    Correct Answer
    A. Types of striated muscle; skeletal, cardiac, smooth
    Explanation
    The group that is incorrect is "Types of striated muscle; skeletal, cardiac, smooth." The term "striated muscle" refers to skeletal and cardiac muscle, which have a striped appearance due to the arrangement of their contractile proteins. Smooth muscle, on the other hand, does not have this striped appearance and is not considered a type of striated muscle.

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