PHYSIOLOGY
SKELETAL MUSCLE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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elasticity.
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flexibility.
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excitability.
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contractility.
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Detailed explanation-1: -Contractility is the ability of muscle cells to forcefully shorten. For instance, in order to flex (decrease the angle of a joint) your elbow you need to contract (shorten) the biceps brachii and other elbow flexor muscles in the anterior arm.
Detailed explanation-2: -Contractility represents the ability of the myocardial muscle to shorten or thicken against a load. Although ejection fraction (EF) is the most common clinical assessment of contractility in practice, it is highly dependent on ventricular afterload.
Detailed explanation-3: -The correct option is A. Sarcomeres. During contraction, the ends of the sarcomeres are pulled closer together, thus shortening the length of the muscle fiber.
Detailed explanation-4: -The sarcomere of striated muscles. Depicted in Figure 1 is the sarcomere, which is the basic contractile unit of striated muscle.