Electron microscopic studies of the sarcomeres have revealed that during muscle contraction

The width of A-band remains constant

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The width of the H-zone becomes smaller

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The width of I-band increases

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The diameter of the fibre increases

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Solution

The correct option is D The width of A-band remains constant
During muscle contraction, the A - band with a length of 1.85 micrometers does not undergo any contraction. However, the I-bands and the H-zone shorten. This causes the Z lines to come closer together. So, the correct answer is 'The width of A-band remains constant'.

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Similar questions

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

During muscular contraction, which of the following events occur?

(i) H – zone disappears (ii) A band widens

(iii) I – band reduces in width (iv) Width of A band is unaffected

(v) M line and Z line come closer

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