PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following does NOT change during muscle contraction?
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H zones disappear
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Z discs move closer together
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Sarcomeres shorten
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A bands shorten
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Explanation:
Detailed explanation-1: -The Z-lines come together, and so the sarcomere shortens as well. However, the A band does not change length during muscle contraction, since its length is the same as the length of the thick filaments.
Detailed explanation-2: -Upon muscle contraction, the A-bands do not change their length i.e the length of A band remains constant. whereas the I-bands and the H-zone shorten. This causes the Z lines to come closer together.
There is 1 question to complete.