PHYSIOLOGY
MUSCLE STRUCTURE FUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following decreases during muscle contraction?
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M line
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A band
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H zone
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Z line
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Explanation:
Detailed explanation-1: -When muscle contracts, The Z discs come close together. The width of the I bands decreases. The width of the H zones decreases.
Detailed explanation-2: -During muscle contraction, the I band reduces in size as the overlap between the thick filaments and the thin filaments increases. The H zone also decreases in length because of the same reason.
Detailed explanation-3: -The H zone-the central region of the A zone-contains only thick filaments (myosin) and is shortened during contraction. The H zone becomes smaller and smaller due to the increasing overlap of actin and myosin filaments, and the muscle shortens.
There is 1 question to complete.