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Q.

During muscle contraction, which of the following events occur?
A) ‘H’ zone decreases
B) ‘A’ band widens
C) ‘I’ band reduces in width
D) ATP hydrolysis
E) Z-lines attached to the actins are pulled inwards.
Choose the correct answer from the options given below.

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a

B, C, D, E only

b

B, D, E, A only

c

A, C, D, E only

d

A, B, C, D only

answer is B.

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Detailed Solution

During muscle contraction, ‘H’ zone decreases, ‘I’ band reduces in width, ATP hydrolysis occurs, Z-lines attached to the actins are pulled inwards.

'A' band retains its width. It does not widen.

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During muscle contraction, which of the following events occur?A) ‘H’ zone decreasesB) ‘A’ band widens C) ‘I’ band reduces in widthD) ATP hydrolysis E) Z-lines attached to the actins are pulled inwards.Choose the correct answer from the options given below.