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-H band and I band 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: -Since during muscle contraction, the myosin filaments overlap the actin filaments, the I band diminishes in size because the region of overlap between the actin and myosin increases. The H-zone also diminishes and eventually disappears as the region of overlap between myosin and actin filament increases.
Detailed explanation-2: -The H-zone contains only thick filaments. The A-band contains both thick and thin filaments and is the center of the sarcomere that spans the H zone. When the muscle contracts, the H-zone, I-band, the distance between Z-lines all become smaller, whereas the A band remains the same.
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