PHYSIOLOGY
SKELETAL MUSCLE
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In a relaxed muscle, the H zone is at its narrowest width
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True
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False
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -In a contracting muscle the Z lines come closer together. In a relaxed muscle, the H zone is at its narrowest width.
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.
Detailed explanation-3: -H-band is the zone of the thick filaments that has no actin. Within the H-zone is a thin M-line (from the German “mittel” meaning middle), appears in the middle of the sarcomere formed of cross-connecting elements of the cytoskeleton.
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