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Which statement is correct for muscle contraction?

1. Length of H-line decreases
2. Length of A-band remains constant
3. Length of I-band increases
4. Length of two Z-lines increases

Correct answer: Length of A-band remains constant

Solution

The A-band corresponds to the length of the thick (myosin) filaments, which does not change during contraction. As actin slides inward, the I-band and H-zone shorten, but the A-band remains constant.

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