Which statement is correct for muscle contraction?

Length of H-zone decreases

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Length of A-band remains constant

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Length of I-band increases

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Length of two Z-line increases

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Solution

The correct options are
A Length of H-zone decreases
B Length of A-band remains constant
Upon muscle contraction, the A-bands do not change their length (1.85 micrometres in mammalian skeletal muscle), whereas the I-bands and the H-zone shorten. This causes the Z lines to come closer together.

So, the correct answer is 'A, B'.

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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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