MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The length of the resting sarcomere is
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the same length as the muscle fiber.
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the same length as a contracted sarcomere.
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longer than the length of a contracted sarcomere.
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shorter than the length of a contracted sarcomere.
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Explanation:
Detailed explanation-1: -The resting sarcomere is about 2.2 mm long.
Detailed explanation-2: -If the resting length is shorter or longer, contraction is compromised.
Detailed explanation-3: -Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts.
Detailed explanation-4: -Average sarcomere lengths varied substantially for the different TA sites. At full dorsiflexion (shortest muscle length), mean sarcomere lengths ranged from 2.1 to 2.3 m, with sarcomeres at the “medial” site being significantly longer than sarcomeres at the “proximal” site (Figure 3).
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