PHYSIOLOGY
SARCOMERE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a contracted muscle fiber, identify what occurs within the following area of the sarcomere-zone of overlap length.
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increase
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decrease
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stay the same
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None of the above
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Explanation:
Detailed explanation-1: -The Zone of overlap, the A band, and the H zone all contain myosin, which is the thick filament of the sarcomere.
Detailed explanation-2: -When (a) a sarcomere (b) contracts, the Z lines move closer together and the I band gets smaller. The A band stays the same width and, at full contraction, the thin filaments overlap. When a sarcomere shortens, some regions shorten whereas others stay the same length.
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