NEET Previous Year Question
Stimulation of a muscle fibre by a motor neuron occurs at
Topic: NEET PYQ
Answer: A. Full step-by-step solution below.
- AThe neuromuscular junction
- BThe transverse tubules
- CThe myofibril
- DThe sacroplasmic reticulum
Correct answer: A
Solution
(a) Stimulation of a muscle fiber by a motor neuron takes place directly at the neuromuscular junction (also known as the motor end-plate). This is the specialized chemical synapse where the axon terminal of a motor neuron meets the plasma membrane (sarcolemma) of a muscle fiber. When an electrical impulse (action potential) reaches this junction, it triggers the release of the neurotransmitter acetylcholine, which initiates the electrical signal in the muscle fiber.More Locomotion & Movement PYQs
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