NEET 2026 Biology question
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 Ca into sarcoplasm. C. Increase in Ca inactivates the actin for breaking cross bridges. D. 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.
Solution
A is correct: a motor neuron carries the CNS signal to the neuromuscular junction, releasing acetylcholine that generates an action potential in the sarcolemma. B is correct: the action potential spreads through the fibre and releases Ca++ from the sarcoplasmic reticulum into the sarcoplasm. C is incorrect: Ca++ binds
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