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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Similar questions

a

i

Z

M

During muscle contraction, which of the following events occur?

(a) H-zone disappears
(b) A-band widens
(c) I-band reduces in width
(d) Width of A-band in unaffected
(e) M line and Z line come closer

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