First slide

Muscle

Question

During muscle contraction,

Easy

A

Z membranes move away from each other; I bands are reduced in length
B

Z membranes are brought closer; A bands are reduced in length
C

M lines are brought closer; A bands are reduced in length
D

Z membranes are brought closer; I bands are reduced in length

Solution

During muscle contraction, cross-bridges pull the attached actin filaments towards the centre of A band. The Z lines attached to these actins are also pulled inwards thereby causing a shortening of the sarcomere. the I bands get reduced, whereas the A bands retain the length.

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