PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Alternating dark, thick filaments are found in the
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A bands
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I bands
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Z band
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H band
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Explanation:
Detailed explanation-1: -The A band is the region of the sarcomere that contains the myosin (thick) filaments, regardless of overlap. This means that myosin is exclusive to the A band, but that this region contains both actin and myosin due to overlap.
Detailed explanation-2: -The arrangement of the thick myosin filaments across the myofibrils and the cell causes them to refract light and produce a dark band known as the A Band. In between the A bands is a light area where there are no thick myofilaments, only thin actin filaments.
Detailed explanation-3: -A-band contains both actin and myosin. M-line and Z-line are in the middle of thick and thin filaments, respectively.
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