Muscle Contractions And Functions

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| By HeatherOta

HeatherOta

Community Contributor

Quizzes Created: 1 | Total Attempts: 1,574

Questions: 10 | Attempts: 1,590 | Updated: Mar 22, 2023

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Questions and Answers

1.

Concentric contraction is
- A.
  
  Usually active and voluntary
- B.
  
  Usually involuntary, in order to protect the joint
- C.
  
  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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2.

Muscle contraction as fibers lengthen is
- A.
  
  Eccentric contraction
- B.
  
  Concentric contraction
- C.
  
  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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3.

Which three of the following are eccentric contraction?
- A.
  
  Muscle contraction as fibers lengthen
- B.
  
  Muscle contraction as fibers shorten
- C.
  
  Usually involuntary, in order to protect the joint
- D.
  
  Usually antagonistic - purpose is to decelerate the agonist
- E.
  
  Usually active, voluntary
Correct Answer(s)
A. Muscle contraction as fibers lengthen
C. Usually involuntary, in order to protect the joint
D. 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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4.

Stabilizers are smaller muscles providing assistance to the larger working muscle group.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
synergists provide assistance to the prime movers

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5.

The antagonist muscle acts in
- A.
  
  Opposition to the movement generated by agonists
- B.
  
  Perform a particular motion
- C.
  
  Make strength training more effective
Correct Answer
A. Opposition to the movement generated by agonists

Explanation
The antagonist muscle is responsible for opposing the movement generated by agonist muscles. This means that while the agonist muscle is contracting to perform a particular motion, the antagonist muscle is relaxing and lengthening to allow for smooth and controlled movement. This opposition between the agonist and antagonist muscles ensures that the motion is balanced and coordinated. By working in opposition, the antagonist muscle helps to stabilize and control the movement, making strength training more effective and reducing the risk of injury.

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6.

Agonists perform a particular action
- A.
  
  True
- B.
  
  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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7.

Biceps and Brachioradialis are antagonists?
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Biceps and triceps

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8.

Isotonic muscle contractions push an object that cannot be moved.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
Isotonic muscle contractions are with movement around the joint.

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9.

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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10.

Antagonists are muscles responsible for returning a limb to its initial position.
- A.
  
  True
- B.
  
  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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Muscle Contractions And Functions

Concentric contraction is

Muscle contraction as fibers lengthen is

Which three of the following are eccentric contraction?

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

The antagonist muscle acts in

Agonists perform a particular action

Biceps and Brachioradialis are antagonists?

Isotonic muscle contractions push an object that cannot be moved.

Isometric contraction is a muscle contraction at the _______ position.

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