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Consider the following.
a) A-band shortens
b) Sarcomere shortens
c) Z-lines move apart
d) I-band remains same sized
e) H-zone disappears
Which among the above occur during muscle contraction?

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b, c, d

a, b, c, d, e

b, e

b, d, e

answer is C.

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Detailed Solution

During muscle contraction, A-band remains unchanged.

The ‘Z’ line attached to the actins are pulled inwards thereby causing a shortening of the sarcomere.

The I-band gets reduced during muscle contraction.

The H-zones get disappeared during contraction as the actin filaments to slide over myosin filaments.

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