An Interesting Quiz On Chapter 9 Anatomy

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  • 1/48 Questions

    Which of the following muscles is described as striated and involuntary?

    • Smooth
    • Cardiac
    • Skeletal
    • Aponeurosis
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Anatomy Quizzes & Trivia
About This Quiz

Did you know that the human brain has a memory capacity, which is the equivalent of more than four terabytes on a hard drive? The human body has a lot of shocking facts, which we were able to cover in chapter 9 of the anatomy class. Take this interesting quiz and see how much you know.

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  • 2. 

    Actin is

    • Located within the neuromuscular junction.

    • Contractile protein that is called a thin filament.

    • Called the thick filament.

    • Stored within the sarcoplasmic reticulum.

    Correct Answer
    A. Contractile protein that is called a thin filament.
    Explanation
    Actin is a contractile protein that is called a thin filament. Actin is a major component of the cytoskeleton and is responsible for the contraction of muscle fibers. It forms a filamentous structure along with myosin, which is a thick filament, to enable muscle contraction. Actin filaments slide past myosin filaments during muscle contraction, resulting in the shortening of muscle fibers. Therefore, the correct answer is that actin is a contractile protein that is called a thin filament.

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  • 3. 

    Which of the following forms crossbridges with actin?

    • Sarcoplasmic reticulum

    • T-tubules

    • Myosin

    • Sarcolemma

    Correct Answer
    A. Myosin
    Explanation
    Myosin is the correct answer because it is the protein responsible for forming crossbridges with actin during muscle contraction. These crossbridges allow for the sliding of actin and myosin filaments, leading to muscle contraction. The sarcoplasmic reticulum is responsible for storing and releasing calcium ions, which are necessary for muscle contraction, but it does not directly form crossbridges with actin. T-tubules are invaginations of the sarcolemma that help propagate action potentials, but they also do not form crossbridges with actin. Sarcolemma is the plasma membrane of muscle cells and does not directly interact with actin to form crossbridges.

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  • 4. 

               "Pumping iron" is most likely to cause..

    • Atrophy.

    • Contracture formation.

    • Hypertrophy.

    • Muscular dystrophy.

    Correct Answer
    A. Hypertrophy.
    Explanation
    "Pumping iron" refers to the activity of weightlifting or strength training, which involves repeatedly contracting and relaxing muscles against resistance. This type of exercise is known to stimulate muscle growth and increase muscle size, a process called hypertrophy. Atrophy refers to the wasting or shrinking of muscles, which is unlikely to occur with regular weightlifting. Contracture formation refers to the permanent shortening or tightening of muscles or tendons, which is also not likely to occur with weightlifting. Muscular dystrophy is a genetic disorder characterized by progressive muscle weakness and degeneration, which is unrelated to weightlifting. Therefore, the most likely effect of "pumping iron" is hypertrophy.

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  • 5. 

    The orbicularis oris muscle

    • Surrounds the mouth.

    • Flexes the head.

    • Is the smiling muscle.

    • Closes the eye.

    Correct Answer
    A. Surrounds the mouth.
    Explanation
    The orbicularis oris muscle is responsible for surrounding the mouth. This muscle is located around the lips and plays a crucial role in various facial expressions, including puckering the lips, closing the mouth, and controlling the movement of the lips during speech and eating. It helps in actions such as smiling, kissing, and whistling.

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  • 6. 

    Which of the following is not a facial muscle?

    • Orbicularis oculi

    • Zygomaticus

    • Sternocleidomastoid

    • Frontalis

    Correct Answer
    A. Sternocleidomastoid
    Explanation
    The sternocleidomastoid is not a facial muscle. It is a large muscle located in the neck that helps with head movement and is not involved in facial expressions. The other three options, orbicularis oculi, zygomaticus, and frontalis, are all facial muscles that are responsible for various facial expressions such as blinking, smiling, and raising the eyebrows.

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  • 7. 

    This muscle is located on the posterior part of the body

    • Latissimus dorsi

    • Pectoralis major

    • Quadriceps femoris

    • Sternocleidomastoid

    Correct Answer
    A. Latissimus dorsi
    Explanation
    The latissimus dorsi muscle is located on the posterior part of the body. It is a large, flat muscle that covers the lower and middle back. It originates from the lower spine and iliac crest, and it inserts into the upper arm bone. The latissimus dorsi muscle is responsible for various movements of the shoulder joint, such as extension, adduction, and medial rotation. It also assists in movements of the spine, including extension and lateral flexion.

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  • 8. 

    The group of muscles located on the posterior thigh

    • Rotator cuff muscles

    • Quadriceps femoris

    • Hamstrings

    • Muscles of mastication

    Correct Answer
    A. Hamstrings
    Explanation
    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 joint and extending the hip joint. They play a crucial role in activities such as walking, running, and jumping.

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  • 9. 

    The biceps femoris, semitendinosus, and semimembranosus

    • Flex the foot.

    • Attach to the patella.

    • Are the hamstrings.

    • Are located on the anterior thigh.

    Correct Answer
    A. Are the hamstrings.
    Explanation
    The biceps femoris, semitendinosus, and semimembranosus are collectively known as the hamstrings. They are a group of muscles located on the posterior thigh. These muscles play a crucial role in knee flexion and hip extension. They are also involved in the stabilization of the knee joint.

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  • 10. 

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

    • Insert on the calcaneus.

    • Flex the leg at the knee.

    • Are antagonistic to the quadriceps femoris.

    • Are the muscles of the quadriceps femoris.

    Correct Answer
    A. Are the muscles of the quadriceps femoris.
    Explanation
    The rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius are all muscles that make up the quadriceps femoris. They work together to extend the leg at the knee joint. Therefore, the correct answer is that these muscles are the muscles of the quadriceps femoris.

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  • 11. 

    The quadripceps femoris group and the hamstrings

    • Lie along the anterior part of the leg.

    • Flex the foot.

    • Lie along the thigh.

    • Shrug the shoulders.

    Correct Answer
    A. Lie along the thigh.
    Explanation
    The correct answer is "lie along the thigh." The quadriceps femoris group and the hamstrings are both located in the thigh region of the leg. They are major muscle groups that play a crucial role in leg movement and stability. The quadriceps femoris group is responsible for extending the knee joint, while the hamstrings are responsible for flexing the knee joint. Therefore, it is accurate to say that these muscles lie along the thigh.

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  • 12. 

    This flat muscle covers the forehead and raises the eyebrows (for a “surprised” look).

    • Frontalis

    • Zygomaticus

    • Masseter

    • Buccinator

    Correct Answer
    A. Frontalis
    Explanation
    The frontalis is the correct answer because it is a flat muscle that covers the forehead and is responsible for raising the eyebrows, which creates a surprised look. The zygomaticus is a muscle that controls smiling, the masseter is a muscle that controls chewing, and the buccinator is a muscle that controls the movement of the cheeks. Therefore, the frontalis is the only muscle listed that matches the given description.

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  • 13. 

    The levator palpebrae superioris

    • Purses the lips.

    • Allows one to whistle.

    • Raises the eyelids.

    • Wiggles the nose.

    Correct Answer
    A. Raises the eyelids.
    Explanation
    The levator palpebrae superioris is a muscle located in the upper eyelid. Its main function is to raise the eyelids, allowing us to open our eyes. This muscle plays a crucial role in the movement and control of the eyelids, helping us to blink, maintain eye contact, and protect our eyes. It is not involved in actions such as pursing the lips, whistling, or wiggling the nose.

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  • 14. 

    The smiling muscle is the

    • Buccinator.

    • Zygomaticus

    • Frontalis.

    • Orbicularis oris.

    Correct Answer
    A. Zygomaticus
    Explanation
    The zygomaticus muscle is responsible for smiling. When this muscle contracts, it pulls the corners of the mouth upward, creating a smile. The buccinator muscle is located in the cheek and is involved in activities such as chewing and blowing air. The frontalis muscle is located in the forehead and is responsible for raising the eyebrows and creating forehead wrinkles. The orbicularis oris muscle is responsible for puckering the lips and closing the mouth. Therefore, the correct answer is zygomaticus.

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  • 15. 

    Which muscle is located in the lower extremities?

    • Peroneus longus

    • Latissimus dorsi

    • Serratus anterior

    • Pectoralis major

    Correct Answer
    A. Peroneus longus
    Explanation
    The peroneus longus muscle is located in the lower extremities. It is a muscle in the leg that runs along the outer side of the lower leg and connects to the foot. This muscle is responsible for ankle eversion, which is the movement of the foot away from the midline. It also helps to stabilize the foot and maintain balance during walking and running.

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  • 16. 

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

    • Diaphragm

    • Sternocleidomastoid

    • Serratus anterior

    • Intercostal muscles

    Correct Answer
    A. Intercostal muscles
    Explanation
    The intercostal muscles are located between the ribs and play a crucial role in breathing. They help to expand and contract the rib cage during inhalation and exhalation, allowing for the movement of air in and out of the lungs. Without the intercostal muscles, the rib cage would not be able to move effectively, leading to difficulty in breathing.

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  • 17. 

    This gr0up of muscles move the arms at the shoulder

    • Quadriceps femoris group

    • Hamstrings

    • Rotator cuff muscles

    • Muscles of mastication

    Correct Answer
    A. Rotator cuff muscles
    Explanation
    The rotator cuff muscles are a group of muscles that move the arms at the shoulder. These muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. They work together to stabilize the shoulder joint and allow for various movements, such as rotating the arm and lifting it away from the body. These muscles are commonly involved in shoulder injuries and can be strengthened through specific exercises to improve shoulder stability and function.

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  • 18. 

    The brachialis and brachioradialis

    • Flex the arm at the elbow.

    • Extend the hand.

    • Are antagonistic to the biceps brachii.

    • Shrug the shoulders.

    Correct Answer
    A. Flex the arm at the elbow.
    Explanation
    The brachialis and brachioradialis muscles are responsible for flexing the arm at the elbow joint. When these muscles contract, they cause the forearm to move towards the upper arm, resulting in elbow flexion. This action allows for movements such as lifting or bending the arm at the elbow.

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  • 19. 

    This muscle attaches to the cranial aponeurosis and wrinkles the forehead.

    • Frontalis

    • Buccinator

    • Orbicularis oculi

    • 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 at the front of the skull and is one of the muscles involved in facial expressions and conveying emotions.

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  • 20. 

    "Make like a scarecrow" by contracting this muscle

    • Frontalis

    • Trapezius

    • Latissimus dorsi

    • Deltoid

    Correct Answer
    A. Deltoid
    Explanation
    The deltoid muscle is responsible for the movement of the arm and shoulder, particularly for raising the arm away from the body. When someone "makes like a scarecrow," they often extend their arms out to the sides, resembling the pose of a scarecrow. This movement engages the deltoid muscle, making it the correct answer. The frontalis muscle is located in the forehead and is responsible for raising the eyebrows, while the trapezius and latissimus dorsi muscles are located in the back and are responsible for various movements of the shoulder and upper back.

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  • 21. 

    This muscle lies along the anterior surface of the humerus and acts synergistically with the brachialis and brachioradialis to flex the arm at the elbow.

    • Deltoid

    • Triceps brachii

    • Biceps brachii

    • Latissimus dorsi

    Correct Answer
    A. Biceps brachii
    Explanation
    The biceps brachii muscle is the correct answer because it lies along the anterior surface of the humerus and works together with the brachialis and brachioradialis muscles to flex the arm at the elbow. The deltoid muscle is not involved in flexing the arm at the elbow, but rather in shoulder abduction and flexion. The triceps brachii muscle is responsible for extending the arm at the elbow, not flexing it. The latissimus dorsi muscle is primarily involved in shoulder extension and adduction, not elbow flexion.

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  • 22. 

    The gastrocnemius and the soleus are commonly called the

    • Swimmer’s muscles.

    • Toe dancer’s muscles.

    • Muscles of mastication.

    • Trumpeter’s muscles.

    Correct Answer
    A. Toe dancer’s muscles.
    Explanation
    The gastrocnemius and the soleus muscles are commonly referred to as the "toe dancer's muscles" because they are heavily involved in the movements and strength required for ballet and other forms of toe dancing. These muscles are responsible for pointing and flexing the foot, providing stability and control during toe stands and other intricate footwork.

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  • 23. 

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

    • Ligament

    • Tendon

    • Linea alba

    • Aponeurosis

    Correct Answer
    A. 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 abdomen, and aponeurosis is a sheet-like tendon.

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  • 24. 

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

    • Sarcomere

    • Synapse

    • Fascicle

    • Sarcoplasmic reticulum

    Correct Answer
    A. Sarcomere
    Explanation
    A sarcomere is a series of contractile units that make up each myofibril. Each sarcomere extends from one Z line to another Z line. This is the basic functional unit of a muscle, where the actin and myosin filaments interact to generate muscle contractions. The other options, synapse, fascicle, and sarcoplasmic reticulum, are not related to the contractile units of a myofibril.

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  • 25. 

    This structure is an extension of the sarcolemma or cell membrane; it penetrates the interior of the muscle and carries the electrical signal to the deepest part of the muscle.

    • Sarcoplasmic reticulum

    • T-tubule

    • Z line

    • Tendon

    Correct Answer
    A. T-tubule
    Explanation
    The T-tubule is a structure that extends from the sarcolemma or cell membrane into the muscle fibers. It plays a crucial role in muscle contraction by carrying the electrical signal, known as an action potential, from the surface of the muscle to the deepest parts of the muscle. This allows for synchronized and coordinated contraction of the muscle fibers. The T-tubules are essential for transmitting the signal to the sarcoplasmic reticulum, which then releases calcium ions, initiating the muscle contraction process.

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  • 26. 

    The sarcoplasmic reticulum

    • Stores ACh.

    • Is located within the neuromuscular junction.

    • Envelops the sarcomere-containing myofibrils.

    • Is a contractile protein.

    Correct Answer
    A. Envelops the sarcomere-containing myofibrils.
    Explanation
    The sarcoplasmic reticulum is a specialized organelle found in muscle cells that is responsible for storing and releasing calcium ions. It surrounds the myofibrils, which are the contractile units of muscle cells that contain sarcomeres. The sarcomeres are the functional units of muscle contraction, composed of actin and myosin filaments. Therefore, the sarcoplasmic reticulum envelopes the sarcomere-containing myofibrils, allowing for the regulation and coordination of muscle contraction.

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  • 27. 

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

    • T-tubule

    • Neuromuscular junction

    • Fascicle

    • Sarcoplasmic reticulum

    Correct Answer
    A. T-tubule
    Explanation
    The correct answer is sarcoplasmic reticulum. The sarcoplasmic reticulum is a specialized organelle found in muscle cells that is responsible for storing and releasing calcium ions. During muscle relaxation, calcium ions are actively pumped back into the sarcoplasmic reticulum, reducing their concentration in the cytoplasm and allowing the muscle to relax. The T-tubules, on the other hand, are invaginations of the muscle cell membrane that help propagate action potentials deep into the muscle fiber, but they do not store calcium ions.

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  • 28. 

    Acetylcholine is released from the prejunctional membrane in response to the

    • Nerve impulse.

    • Binding of the myosin heads to actin.

    • Release of calcium from the sarcoplasmic reticulum.

    • 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, also known as action potentials, are electrical signals that travel along neurons to transmit information. 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 or nerve signal transmission. Therefore, the release of acetylcholine is directly linked to the occurrence of a nerve impulse.

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  • 29. 

    Which of the following is responsible for muscle relaxation?

    • The sarcomere runs out of ATP.

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

    • Calcium is pumped back into the sarcoplasmic reticulum.

    • Acetylcholinesterase in the neuromuscular junction is depleted.

    Correct Answer
    A. Calcium is pumped back into the sarcoplasmic reticulum.
    Explanation
    When a muscle contracts, calcium ions are released from the sarcoplasmic reticulum, allowing actin and myosin to interact and cause muscle contraction. However, for the muscle to relax, calcium ions need to be removed from the sarcomere. This is done by pumping calcium back into the sarcoplasmic reticulum. Therefore, the correct answer is that calcium is pumped back into the sarcoplasmic reticulum for muscle relaxation.

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  • 30. 

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

    • Twitch

    • Tetany

    • Atrophy

    • Hypertrophy

    Correct Answer
    A. Tetany
    Explanation
    Tetany describes a muscle that remains in a contracted state. It is a condition characterized by prolonged and involuntary muscle contractions. These contractions can be caused by a variety of factors, such as low levels of calcium or magnesium in the blood. Tetany can lead to muscle spasms, cramps, and stiffness. It can affect any muscle in the body and may cause pain and discomfort. Treatment usually involves addressing the underlying cause and restoring the balance of electrolytes in the body.

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  • 31. 

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

    • Contracture

    • Hypertrophy

    • Muscle dystrophy

    • Disuse atrophy

    Correct Answer
    A. Disuse atrophy
    Explanation
    When a limb is immobilized in a cast for an extended period of time, the muscles in that limb are not being used or exercised. This lack of use leads to disuse atrophy, which is the wasting away or shrinking of the muscles due to inactivity. In this case, Joey's leg appears smaller than the uninjured leg because the muscles in his leg have experienced disuse atrophy during the time it was in a nonweight-bearing cast.

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  • 32. 

    Which muscle covers the shoulder like a shoulder pad?

    • Deltoid

    • Trapezius

    • Biceps brachii

    • Sternocleidomastoid

    Correct Answer
    A. Deltoid
    Explanation
    The deltoid muscle covers the shoulder like a shoulder pad. It is a triangular-shaped muscle that forms the rounded contour of the shoulder and provides stability and movement to the shoulder joint. It is responsible for raising the arm to the side, forward, and backward, as well as rotating the arm. The trapezius muscle is located in the upper back and neck region, the biceps brachii is a muscle in the upper arm, and the sternocleidomastoid is a muscle in the neck.

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  • 33. 

    Which of the following “muscle words” refers to chest?

    • Rectus

    • Latissimus

    • Vastus

    • Pectoralis

    Correct Answer
    A. Pectoralis
    Explanation
    The term "pectoralis" is commonly used to refer to the muscles located in the chest area. It is derived from the Latin word "pectus" which means chest. Therefore, out of the given options, "pectoralis" is the correct muscle word that refers to the chest.

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  • 34. 

    This muscle is located in the upper back and posterior neck region; contraction of this muscle causes you to look up at the sky.

    • Pectoralis major

    • Sternocleidomastoid

    • Trapezius

    • Diaphragm

    Correct Answer
    A. Trapezius
    Explanation
    The trapezius muscle is located in the upper back and posterior neck region. When this muscle contracts, it causes you to look up at the sky. The pectoralis major is a muscle in the chest, the sternocleidomastoid is a muscle in the neck that allows for head rotation, and the diaphragm is a muscle involved in breathing. Therefore, the correct answer is trapezius.

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  • 35. 

    This muscle separates the thoracic and abdominal cavities and is also the chief breathing muscle.

    • Serratus anterior

    • Intercostal muscle

    • Sternocleidomastoid

    • Diaphragm

    Correct Answer
    A. Diaphragm
    Explanation
    The diaphragm is a dome-shaped muscle that separates the thoracic and abdominal cavities. It is the primary muscle responsible for breathing, contracting and relaxing to facilitate inhalation and exhalation. When the diaphragm contracts, it moves downward, creating more space in the chest cavity and allowing the lungs to expand and fill with air. When it relaxes, the diaphragm moves upward, compressing the lungs and forcing air out. Therefore, the diaphragm is not only the muscle that separates the thoracic and abdominal cavities but also the chief breathing muscle.

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  • 36. 

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

    • Sternocleidomastoid

    • Frontalis

    • Pectoralis major

    • 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, originating from the sternum and clavicle and attaching to the mastoid process of the skull. When this muscle contracts on one side, it causes the head to rotate towards the opposite side. Therefore, when you turn your head to the left and right, you are primarily using the sternocleidomastoid muscle.

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  • 37. 

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

    • Gastrocnemius.

    • Quadriceps femoris

    • Adductors

    • Sartorius

    Correct Answer
    A. Adductors
    Explanation
    The adductors are a group of muscles located on the inner surface of the thigh. They are responsible for moving the thigh towards the midline of the body, a movement known as adduction. This is in contrast to the other options listed, such as the gastrocnemius (a calf muscle) and quadriceps femoris (a group of muscles on the front of the thigh) which are not involved in adduction. The sartorius muscle, although located in the thigh, is primarily responsible for flexing and rotating the hip and knee, not adducting the thigh.

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  • 38. 

    Where is the vastus lateralis located?

    • Upper arm

    • Thigh

    • Chest

    • Back

    Correct Answer
    A. Thigh
    Explanation
    The vastus lateralis is located in the thigh. It is one of the four muscles that make up the quadriceps femoris group. The vastus lateralis is the largest and most powerful of the quadriceps muscles and is located on the outer side of the thigh. It plays a key role in extending the knee joint and is commonly targeted during exercises such as squats and lunges.

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  • 39. 

    What is the function of the masseter muscle?

    • Adducts the thigh

    • Chews food

    • Lifts the eyelid

    • Flexes the arm

    Correct Answer
    A. Chews food
    Explanation
    The masseter muscle is responsible for chewing food. It is one of the main muscles involved in the process of mastication, along with other muscles of the jaw. When the masseter muscle contracts, it helps to close the jaw and move it in a grinding motion, allowing for the breakdown of food into smaller particles that can be easily swallowed and digested.

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  • 40. 

    The Achilles tendon attaches the soleus and this muscle to the calcaneus.

    • Sartorius

    • Quadriceps femoris

    • Gastrocnemius

    • Vastus lateralis

    Correct Answer
    A. Gastrocnemius
    Explanation
    The correct answer is gastrocnemius because the Achilles tendon connects the soleus and gastrocnemius muscles to the calcaneus. The sartorius muscle is not involved in this connection, and the quadriceps femoris and vastus lateralis muscles are located in the thigh, not the lower leg where the Achilles tendon is located.

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  • 41. 

    On which large muscle do you sit?

    • Latissimus dorsi

    • Gastrocnemius

    • Gluteus maximus

    • Rectus femoris

    Correct Answer
    A. Gluteus maximus
    Explanation
    The gluteus maximus is the correct answer because it is the largest muscle in the body and is located in the buttocks. It plays a major role in hip extension and is responsible for the action of sitting.

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  • 42. 

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

    • Smooth muscles.

    • Abdominal muscles.

    • Breathing muscles.

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

    Correct Answer
    A. 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 maintaining core stability, supporting the spine, and assisting in movements such as bending, twisting, and flexing the trunk. They are commonly referred to as the abdominal muscles and are responsible for giving the abdomen its shape and strength.

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  • 43. 

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

    • Biceps brachii

    • Biceps femoris

    • Deltoid

    • Triceps brachii

    Correct Answer
    A. Triceps brachii
    Explanation
    The triceps brachii is the correct answer because it is a muscle that lies along the posterior surface of the upper arm. It is responsible for extending the forearm and is commonly used to bear weight in crutch walking. The biceps brachii, biceps femoris, and deltoid are not involved in these actions and do not lie along the posterior surface of the upper arm.

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  • 44. 

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

    • Twitch

    • Contracture

    • Ossification

    • Recruitment

    Correct Answer
    A. Recruitment
    Explanation
    Recruitment refers to the process of activating more motor units within a muscle to generate a stronger contraction. When more motor units are recruited, more muscle fibers are stimulated, resulting in an increased force of contraction. This can be achieved by increasing the frequency of nerve impulses to the muscle or by activating additional motor units. Therefore, recruitment is the correct answer as it directly increases the force of contraction of a whole muscle.

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  • 45. 

    The force of muscle contraction is most related to the

    • Amount of calcium that is stored within the sarcoplasmic reticulum.

    • Amount of neurotransmitter released from the prejunctional vesicles.

    • Numbers of crossbridges formed between actin and myosin.

    • Size of the somatic motor neuron.

    Correct Answer
    A. Numbers of crossbridges formed between actin and myosin.
    Explanation
    The force of muscle contraction is most related to the numbers of crossbridges formed between actin and myosin. When a muscle contracts, the myosin heads on the thick filaments form crossbridges with the actin molecules on the thin filaments. The interaction between myosin and actin allows for the sliding of the filaments, resulting in muscle contraction. The more crossbridges that are formed, the stronger the force of contraction. Therefore, the numbers of crossbridges formed between actin and myosin directly determine the force of muscle contraction.

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  • 46. 

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

    • Crossbridge formation between actin and myosin

    • Release of calcium from the sarcoplasmic reticulum

    • Activation of the NM receptor within the neuromuscular junction

    • Release of neurotransmitter (ACh) from the somatic motor neuron

    Correct Answer
    A. Release of neurotransmitter (ACh) from the somatic motor neuron
    Explanation
    The release of 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 receptors on the muscle fiber, leading to the activation of the muscle. This activation then triggers a series of events, including the release of calcium from the sarcoplasmic reticulum, which allows for crossbridge formation between actin and myosin. Therefore, the release of ACh is the initial event that starts the process of skeletal muscle contraction.

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  • 47. 

    Which group is incorrect?

    • Types of striated muscle: skeletal, cardiac, smooth

    • Movements: extension, pronation, adduction

    • Movements: flexion, supination, abduction

    • Muscles of the face: frontalis, buccinator, masseter

    Correct Answer
    A. Types of striated muscle: skeletal, cardiac, smooth
    Explanation
    The group "types of striated muscle: skeletal, cardiac, smooth" is incorrect because smooth muscle is not striated. Striated muscles have a striped appearance due to the arrangement of their contractile proteins, while smooth muscles lack this characteristic. The correct group should include only skeletal and cardiac muscles as types of striated muscle.

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  • 48. 

    Which group is incorrect?

    • Muscles in lower extremities: hamstrings, quadriceps, gastrocnemius

    • Muscles involved in breathing: diaphragm, intercostals, hamstrings

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

    • Muscles in the upper extremities: triceps brachii, biceps brachii, pronator

    Correct Answer
    A. Muscles involved in breathing: diaphragm, intercostals, hamstrings
    Explanation
    The group that is incorrect is "muscles involved in breathing: diaphragm, intercostals, hamstrings". The diaphragm and intercostals are indeed muscles involved in breathing, but the hamstrings are not. The hamstrings are muscles located in the lower extremities, not directly involved in the process of breathing.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 17, 2009
    Quiz Created by
    Nenegto04

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