PHYSIOLOGY
SLIDING FILAMENT MODEL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of these regions shortens during muscle contraction?
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A band
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I band
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H zone
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both A and I bands
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Explanation:
Detailed explanation-1: -The H zone-the central region of the A zone-contains only thick filaments and is shortened during contraction.
Detailed explanation-2: -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. Thus when the muscle is fully contracted, the H zone is no longer visible.
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