Choose the correct statements regarding muscle contraction.

Biology NEET Previous Year Question Paper NEET 2026 Previous Year Question Paper Single Correct MCQ

Published on: August 21, 2026

A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.
A and B only

The neural signal generates an action potential which causes the release of

into sarcoplasm.

and

only

Increase in

inactivates the actin for breaking cross bridges.
C and D only

Actin binds to the myosin head to form a cross bridge.
(E) Shortening of sarcomere takes place, by pulling actin filaments towards the centre of 'A' band. Choose the correct answer from the options given below:
A, B, D and E only

Text Solution

Verified by Experts

The correct answer is:

A, B, D and E only.
Here is why:

& : A CNS signal travels via a motor neuron to trigger an action potential, releasing into the sarcoplasm.

is incorrect: actually activates actin by removing the troponin mask; it doesn't inactivate it.
& (E): Myosin heads bind to actin to form cross bridges, pulling actin filaments toward the centre to shorten the sarcomere.

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