PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Increase
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Stays the same
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Decrease
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None of the above
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Detailed explanation-1: -Thin filaments are pulled by the thick filaments toward the center of the sarcomere until the Z discs approach the thick filaments. The zone of overlap, in which thin filaments and thick filaments occupy the same area, increases as the thin filaments move inward.
Detailed explanation-2: -The myosin and actin filaments overlap in peripheral regions of the A band, whereas a middle region (called the H zone) contains only myosin. The actin filaments are attached at their plus ends to the Z disc, which includes the crosslinking protein -actinin.
Detailed explanation-3: -Eccentric contraction occurs when the force of contraction is less than the force of resistance. In other words, the force of resistance is greater than that of contraction, resulting in muscle lengthening and an increased distance between muscle origin and insertion.