ITEC A&p (Muscular System) Q&a

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| By Wayne Duggan
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Wayne Duggan
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Quizzes Created: 17 | Total Attempts: 13,478
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ITEC A&p (Muscular System) Q&a - Quiz


Questions and Answers
  • 1. 

    Smooth Muscle is

    • A.

      Voluntary and spindle shaped

    • B.

      Voluntary and striated

    • C.

      Involuntary and spindle shaped

    • D.

      Involuntary and striated

    Correct Answer
    C. Involuntary and spindle shaped
    Explanation
    Smooth muscle is involuntary and spindle-shaped. Involuntary means that it is not under conscious control, meaning we cannot control its contractions consciously. Smooth muscle is found in the walls of organs and blood vessels and helps with involuntary movements such as digestion and blood flow. The term "spindle-shaped" refers to the elongated shape of smooth muscle cells, which allows them to contract and relax in a coordinated manner. Smooth muscle is different from skeletal muscle, which is voluntary and striated, meaning it is under conscious control and has a striped appearance under a microscope.

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  • 2. 

    Skeletal muscle is

    • A.

      Voluntary and spindle shaped

    • B.

      Voluntary and striated

    • C.

      Involuntary and spindle shaped

    • D.

      Involuntary and striated

    Correct Answer
    B. Voluntary and striated
    Explanation
    Skeletal muscle is classified as voluntary because it is under conscious control, meaning we can choose to contract or relax these muscles. Additionally, skeletal muscle is striated, which means it has a striped appearance due to the arrangement of its contractile proteins. This striation is a result of the organized arrangement of actin and myosin filaments within the muscle fibers.

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  • 3. 

    Cardiac muscle is

    • A.

      Voluntary and spindle shaped

    • B.

      Voluntary and striated

    • C.

      Involuntary and spindle shaped

    • D.

      Involuntary and striated

    Correct Answer
    D. Involuntary and striated
    Explanation
    Cardiac muscle is involuntary and striated. Involuntary means that it is not under conscious control, meaning we cannot control its contractions consciously. Striated refers to the presence of alternating light and dark bands, which give the muscle a striped appearance. Cardiac muscle is found in the walls of the heart and is responsible for the pumping action of the heart. Its involuntary nature allows for the continuous and rhythmic contractions necessary for the heart to function properly. The presence of striations is due to the arrangement of contractile proteins within the muscle cells, giving it the ability to contract forcefully.

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  • 4. 

    Which type of muscle cell is multinucleated ?

    • A.

      Cardiac

    • B.

      Smooth

    • C.

      Skeletal

    • D.

      All of the above

    Correct Answer
    C. Skeletal
    Explanation
    Skeletal muscle cells are multinucleated, meaning they have multiple nuclei within a single cell. This is because skeletal muscles are large and require a significant amount of energy and protein synthesis to function properly. The multiple nuclei allow for efficient gene expression and protein production, contributing to the strength and contractile abilities of skeletal muscles. Cardiac and smooth muscle cells, on the other hand, are mononucleated, meaning they have only one nucleus per cell.

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  • 5. 

    What is an example of the smooth muscle ?

    • A.

      Masseter (face)

    • B.

      Bladder

    • C.

      Heart

    • D.

      Pronator teres (forearm)

    • E.

      Rectus abdominis (belly)

    Correct Answer
    B. Bladder
    Explanation
    The bladder is an example of smooth muscle. Smooth muscle is found in the walls of organs and structures such as blood vessels, the digestive system, and the urinary system. It is involuntary muscle tissue that contracts and relaxes to facilitate the movement of substances through these organs. The bladder is a hollow organ that stores urine and its smooth muscle allows it to expand and contract to accommodate varying amounts of urine.

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  • 6. 

    Each myosin flament is surrounded by _____ actin filaments 

    • A.

      Two

    • B.

      Four

    • C.

      Six

    • D.

      Eight

    • E.

      Seven

    Correct Answer
    C. Six
    Explanation
    Each myosin filament is surrounded by six actin filaments. This is because in muscle contraction, myosin filaments interact with actin filaments to generate force. The myosin heads bind to the actin filaments, forming cross-bridges. The arrangement of six actin filaments surrounding a myosin filament allows for optimal interaction and force generation during muscle contraction.

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  • 7. 

    The muscular system is controlled by what system ?

    • A.

      The cardiovascular

    • B.

      The integumentary

    • C.

      The nervous

    • D.

      None of the above

    Correct Answer
    C. The nervous
    Explanation
    The muscular system is controlled by the nervous system. The nervous system is responsible for transmitting signals from the brain to the muscles, allowing them to contract and relax. This control is necessary for voluntary movements and coordination of muscle activity. The cardiovascular system is responsible for pumping blood and delivering oxygen to the muscles, while the integumentary system is responsible for protecting the body and regulating temperature. Therefore, neither of these systems directly control the muscular system.

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  • 8. 

    How many types of muscles are there ? 

    • A.

      Two

    • B.

      Three (cardiac, smooth and skeletal)

    • C.

      Four

    • D.

      Five

    Correct Answer
    B. Three (cardiac, smooth and skeletal)
    Explanation
    The correct answer is three (cardiac, smooth and skeletal) because these are the three main types of muscles found in the human body. Cardiac muscles are found in the walls of the heart and are responsible for its contractions. Smooth muscles are found in various organs and blood vessels, and they control involuntary movements. Skeletal muscles are attached to bones and are responsible for voluntary movements. Therefore, these three types of muscles cover the major muscle groups in the body.

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  • 9. 

    Which of the following are muscles of the lower arm and hand ?

    • A.

      Tiblias anterior

    • B.

      Soleus

    • C.

      Pernoeus longus

    • D.

      Flexor carpi digitorum

    Correct Answer
    D. Flexor carpi digitorum
    Explanation
    The flexor carpi digitorum is a muscle of the lower arm and hand. It is responsible for flexing the wrist and fingers. The other options listed (tibialis anterior, soleus, and peroneus longus) are muscles of the lower leg and foot, not the lower arm and hand.

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  • 10. 

    What is the action of the obicularis oris ?

    • A.

      To close the mouth

    • B.

      To close the eye

    • C.

      To open the mouth

    • D.

      To raise and retract the lower jaw

    Correct Answer
    C. To open the mouth
    Explanation
    The obicularis oris is a muscle responsible for closing and puckering the lips, not for opening the mouth. Therefore, the given answer is incorrect.

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  • 11. 

    Which of these muscles of the lower leg and foot?

    • A.

      Supinator radii brevis

    • B.

      Gracilis

    • C.

      Peroneus longus

    • D.

      Flexor carpi radialis

    Correct Answer
    C. Peroneus longus
    Explanation
    The correct answer is Peroneus longus. Peroneus longus is a muscle located in the lower leg and foot. It is responsible for plantarflexion and eversion of the foot, as well as providing stability to the ankle joint. It also helps in maintaining balance and stability during walking and running.

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  • 12. 

    Which muscle adducts the arm and medially rotates the humorous?

    • A.

      Teres major

    • B.

      Teres minor

    • C.

      Deltoid

    • D.

      Supraspinatis

    Correct Answer
    B. Teres minor
    Explanation
    The teres minor muscle is responsible for adducting the arm and medially rotating the humerus. It is one of the four muscles that make up the rotator cuff in the shoulder joint. The teres minor works in conjunction with the other rotator cuff muscles to stabilize and control movements of the shoulder joint.

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  • 13. 

    What is the function of striated muscle tissue?

    • A.

      To help support and move the body

    • B.

      To allow the heart to pump blood

    • C.

      To transmit signals

    • D.

      To carry out involuntary functions

    Correct Answer
    A. To help support and move the body
    Explanation
    Striated muscle tissue, also known as skeletal muscle tissue, is responsible for supporting and facilitating movement in the body. This type of muscle tissue is attached to bones and helps to generate force and movement through contractions. It is under voluntary control, meaning that it can be consciously activated and controlled by the individual. This allows for the execution of various movements such as walking, running, and lifting objects. Therefore, the function of striated muscle tissue is to support the body's structure and enable movement.

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  • 14. 

    where would you find triangularis  

    • A.

      Corner of mouth

    • B.

      In the hand

    • C.

      In the foot

    • D.

      Corner of eye

    Correct Answer
    A. Corner of mouth
    Explanation
    Triangularis is a muscle located in the corner of the mouth. It is responsible for pulling the corners of the mouth downward, which creates a frowning or sad expression. This muscle works in opposition to the zygomaticus muscles, which pull the corners of the mouth upward to create a smiling or happy expression. Therefore, the correct answer is corner of mouth.

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  • 15. 

    which of the following is a def. of abduction

    • A.

      Palm of hand down

    • B.

      Sole of foot inwards

    • C.

      Movement of the bone away from the midline

    • D.

      Midline of the body or limb

    Correct Answer
    C. Movement of the bone away from the midline
    Explanation
    Abduction refers to the movement of a bone away from the midline of the body or limb. This means that the bone is being moved in a direction that is away from the center of the body or limb. It is the opposite of adduction, which is the movement of a bone towards the midline. Therefore, the correct answer is "movement of the bone away from the midline."

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  • 16. 

    Definition of plantarflexion

    • A.

      Point toes down

    • B.

      Point toes up

    • C.

      Turn palm down

    • D.

      Turn palm up

    Correct Answer
    A. Point toes down
    Explanation
    Plantarflexion refers to the movement of pointing the toes downward. This movement is achieved by contraction of the muscles on the back of the lower leg, specifically the calf muscles. When the toes are pointed downward, the foot is flexed at the ankle joint, allowing for actions such as walking, running, and standing on tiptoes. Therefore, the correct answer is "point toes down".

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  • 17. 

    wht muscle draws shoulder forward and roates scapula

    • A.

      Rhomboid mahor

    • B.

      Trapiezus

    • C.

      Serratus anterior

    • D.

      Latissimus dorsi

    Correct Answer
    C. Serratus anterior
    Explanation
    The serratus anterior muscle is responsible for drawing the shoulder forward and rotating the scapula. It is located on the side of the chest and connects the scapula to the rib cage. When this muscle contracts, it pulls the scapula forward and helps to rotate it, allowing for movement of the shoulder joint. The other muscles listed (rhomboid major, trapezius, and latissimus dorsi) have different functions and do not specifically draw the shoulder forward and rotate the scapula.

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  • 18. 

    what muscle lifts trunk after sitting

    • A.

      Gluteus maximus,

    • B.

      Minimus,

    • C.

      Medius

    • D.

      Or biceps femoris

    Correct Answer
    A. Gluteus maximus,
    Explanation
    The gluteus maximus is the largest muscle in the buttocks and is responsible for extending and lifting the trunk after sitting. It is involved in movements such as standing up from a seated position or straightening the body while sitting. The gluteus maximus works in conjunction with other muscles to provide stability and power during these movements.

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  • 19. 

    The action of the biceps femoris is to:

    • A.

      Flex the hip, extend the knee

    • B.

      Abduct the leg

    • C.

      Extend the hip, flex the knee

    • D.

      Flex the arm

    Correct Answer
    C. Extend the hip, flex the knee
    Explanation
    The biceps femoris is a muscle located in the back of the thigh. Its main action is to extend the hip joint, which means it helps to move the thigh backward. Additionally, it flexes the knee joint, which means it helps to bend the leg at the knee. Therefore, the correct answer is "Extend the hip, flex the knee."

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  • 20. 

    The action of the gluteus medius muscle is to:  

    • A.

      Extend the femur

    • B.

      Adduct and laterally rotate the femur

    • C.

      Flex the femur

    • D.

      Abduct and medially rotate the femur

    Correct Answer
    D. Abduct and medially rotate the femur
    Explanation
    The gluteus medius muscle is responsible for abducting and medially rotating the femur. This means that it helps to move the leg away from the midline of the body and rotate it inward. This action is important for maintaining balance and stability during activities such as walking, running, and standing on one leg.

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  • 21. 

    Which muscle extends the head?

    • A.

      Sternocleidomastoid

    • B.

      Erector spinae

    • C.

      Trapiezius

    • D.

      Splenius capitis

    Correct Answer
    D. Splenius capitis
    Explanation
    The Splenius Capitis muscle extends the head. It is a deep muscle located in the back of the neck and upper back. When it contracts, it helps to tilt and rotate the head, allowing for extension of the neck. The Sternocleidomastoid muscle is responsible for flexing the head and neck, the Erector Spinae muscles help to maintain posture and extend the spine, and the Trapezius muscle is involved in shoulder movement and stability.

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  • 22. 

    What is the action of the subscapularis?

    • A.

      To rotate the arm inwards

    • B.

      To abduct the arm

    • C.

      To rotate the arm outwards

    • D.

      To adduct the arm

    Correct Answer
    D. To adduct the arm
    Explanation
    The action of the subscapularis muscle is to adduct the arm. Adduction refers to moving the arm towards the midline of the body. The subscapularis muscle is located on the anterior side of the shoulder joint and plays a role in stabilizing and rotating the arm. It helps in various movements, including adduction, internal rotation, and stabilization of the shoulder joint. Therefore, the correct answer is to adduct the arm.

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  • 23. 

    What is the action of the levator labii superioris?

    • A.

      To purse the lips

    • B.

      To turn the lower lip outwards

    • C.

      To lift the upper lip

    • D.

      To pull down the corners of the mouth

    Correct Answer
    C. To lift the upper lip
    Explanation
    The action of the levator labii superioris is to lift the upper lip. This muscle is responsible for elevating the upper lip, which can be seen when smiling or showing the upper teeth. It is involved in facial expressions and helps in various functions such as speaking, eating, and expressing emotions.

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  • 24. 

    Which muscle everts the foot and plantarflexes the ankle?

    • A.

      Peroneus longus

    • B.

      Tibialis anterior

    • C.

      Gastrocnemius

    • D.

      Soleus

    Correct Answer
    A. Peroneus longus
    Explanation
    The peroneus longus muscle is responsible for everting the foot and plantarflexing the ankle. This muscle is located on the outer side of the lower leg and plays a crucial role in stabilizing the ankle during walking and running. When the peroneus longus contracts, it pulls the foot outward (eversion) and points the toes downward (plantarflexion). This movement helps in maintaining balance and stability while walking on uneven surfaces.

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  • 25. 

    What is the action of the biceps femoris?

    • A.

      Extends knee and flexes hip

    • B.

      Flexes elbow

    • C.

      Extends hip and flex knee

    • D.

      Flexes knee and extends hip

    Correct Answer
    C. Extends hip and flex knee
    Explanation
    The biceps femoris is a muscle located in the back of the thigh. Its primary action is to extend the hip joint, which means it helps to move the leg backward. Additionally, it also flexes the knee joint, which means it helps to bend the leg at the knee. Therefore, the correct answer is "Extends hip and flexes knee."

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  • 26. 

    Which muscle rotates the arm medially?

    • A.

      Sternocleidomastoid

    • B.

      Deltoid

    • C.

      Serratus anterior

    • D.

      Pectoralis major

    Correct Answer
    D. Pectoralis major
    Explanation
    The pectoralis major is the muscle responsible for rotating the arm medially. This muscle is located in the chest area and is responsible for movements such as adduction and internal rotation of the arm. When the pectoralis major contracts, it pulls the arm inward and rotates it towards the midline of the body. This allows for movements such as throwing a punch or hugging someone.

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  • 27. 

    The opposing relaxing muscle is known as the:

    • A.

      Agonist

    • B.

      Muscle belly

    • C.

      Insertion

    • D.

      Antagonist

    Correct Answer
    D. Antagonist
    Explanation
    The opposing relaxing muscle is known as the antagonist because it works in opposition to the agonist muscle. While the agonist muscle contracts to produce a movement, the antagonist muscle relaxes to allow that movement to occur smoothly. This relationship between the agonist and antagonist muscles is essential for coordinated and balanced movement.

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  • 28. 

    Which two muscles form the tendon of Achilles?

    • A.

      Gracilis and soleus

    • B.

      Soleus and gastrocnemius

    • C.

      Gastrocnemius and peroneus longus

    • D.

      Peroneus longus and gracilis

    Correct Answer
    B. Soleus and gastrocnemius
    Explanation
    The tendon of Achilles, also known as the Achilles tendon, is formed by the combination of the soleus and gastrocnemius muscles. These two muscles merge together at the lower part of the calf and form a strong tendon that attaches to the back of the heel bone. This tendon is responsible for transmitting the force generated by the calf muscles to the foot, allowing for movements such as walking, running, and jumping.

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  • 29. 

    What is the action of the rhomboids?

    • A.

      Protraction of scapula

    • B.

      Adduction of scapula

    • C.

      Depression of scapula

    • D.

      Elevation of scapula

    Correct Answer
    B. Adduction of scapula
    Explanation
    The action of the rhomboids is to adduct the scapula. This means that they bring the scapula closer to the midline of the body.

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