MediumNEET 2026
+4 / -1
Choose the correct statements regarding muscle contraction.
A
A motor neuron carries a signal sent by the Central Nervous System (CNS) to the sarcolemma of the muscle fibre.
B
The neural signal generates an action potential which causes the release of Ca²⁺ into the sarcoplasm.
C
Increase in Ca²⁺ inactivates the action for breaking cross bridges.
D
Actin binds to the myosin head to form a cross bridge.
Explanation
Motor neurons transmit impulses to muscle fibres, leading to Ca²⁺ release into the sarcoplasm. Calcium enables actin-myosin interaction rather than inactivating it. Cross bridges are formed between actin and myosin, and actin filaments slide towards the centre of the A band during contraction.
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