Muscle Contractions And Functions

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| By HeatherOta
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| Attempts: 1,791
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  • 1/10 Questions

    The antagonist muscle acts in

    • Opposition to the movement generated by agonists
    • Perform a particular motion
    • Make strength training more effective
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About This Quiz

This quiz titled 'Muscle Contractions and Functions' explores the dynamics of muscle movements including concentric and eccentric contractions, and the roles of agonists and antagonists. It assesses understanding of muscle function, enhancing knowledge crucial for fields like sports science and physical therapy.

Muscular System Quizzes & Trivia

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  • 2. 

    Agonists perform a particular action

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Agonists are substances that bind to and activate specific receptors in the body, resulting in a particular action. They mimic the effects of natural substances in the body and can enhance or inhibit certain physiological processes. Therefore, it is correct to say that agonists perform a particular action.

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  • 3. 

    Muscle contraction as fibers lengthen is

    • Eccentric contraction

    • Concentric contraction

    • Isometric contraction

    Correct Answer
    A. Eccentric contraction
    Explanation
    Eccentric contraction refers to the lengthening of muscle fibers while they are under tension. This occurs when the force applied to the muscle is greater than the force produced by the muscle, causing it to elongate. During eccentric contraction, the muscle acts as a brake or decelerator, controlling the speed of movement. This type of contraction is commonly seen in activities such as lowering weights or walking downhill.

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  • 4. 

    Concentric contraction is

    • Usually active and voluntary

    • Usually involuntary, in order to protect the joint

    • Two muscles working together to move a joint

    Correct Answer
    A. Usually active and voluntary
    Explanation
    Concentric contraction refers to the type of muscle contraction where the muscle shortens as it generates force. This type of contraction is usually active and voluntary, meaning that it is under conscious control and initiated by the individual. It is a deliberate action to produce movement or exert force.

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  • 5. 

    Biceps and Brachioradialis are antagonists?

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Biceps and triceps

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  • 6. 

    Antagonists are muscles responsible for returning a limb to its initial position.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Antagonists are muscles that work in opposition to agonist muscles. They help to control and regulate movements by resisting the actions of agonist muscles and returning a limb to its initial position. Therefore, the given statement that antagonists are muscles responsible for returning a limb to its initial position is true.

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  • 7. 

    Isotonic muscle contractions push an object that cannot be moved.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Isotonic muscle contractions are with movement around the joint.

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  • 8. 

    Isometric contraction is a muscle contraction at the _______ position.

    Correct Answer
    same
    Same
    Explanation
    Isometric contraction is a muscle contraction where the muscle length remains the same. In this type of contraction, the muscle generates tension without changing its length. Therefore, the correct answer is "same" or "Same" as it implies that the muscle contraction occurs at the same position without any change in length.

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  • 9. 

    Which three of the following are eccentric contraction?

    • Muscle contraction as fibers lengthen

    • Muscle contraction as fibers shorten

    • Usually involuntary, in order to protect the joint

    • Usually antagonistic - purpose is to decelerate the agonist

    • Usually active, voluntary

    Correct Answer(s)
    A. Muscle contraction as fibers lengthen
    A. Usually involuntary, in order to protect the joint
    A. Usually antagonistic - purpose is to decelerate the agonist
    Explanation
    Eccentric contractions occur when the muscle fibers lengthen while still generating force. This type of contraction is commonly seen when muscles are acting as brakes or decelerators to protect the joint from injury. It is usually involuntary and occurs in response to external forces or to control the movement of the body. The purpose of eccentric contractions is to slow down or decelerate the agonist muscle, which is the muscle primarily responsible for the movement.

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  • 10. 

    Stabilizers are smaller muscles providing assistance to the larger working muscle group.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    synergists provide assistance to the prime movers

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  • Current Version
  • May 19, 2025
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 06, 2011
    Quiz Created by
    HeatherOta
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