Which statement is correct for muscle contraction?

Length of H-zone is increased

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Length of A-band remains constant

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Length of I-band gets increased

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Length between two Z-lines gets increased

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Solution

The correct option is B Length of A-band remains constant
During muscle contraction, actin and myosin interact to form actomyosin. According to sliding filament theory, a cross-bridge is formed by myosin filament to slide actin filament. The A band consists of the region of a thick filament (myosin). Whether at rest or at length, the actual length of the A band remains constant.

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