NEET · Biology · STD 11 - 17. Locomotion and movement

Stimulation of a muscle fiber by a motor neuron occurs at

A the neuromuscular junction
B the transverse tubules
C the myofibril
D the sacroplasmic reticulum.

Verified Solution

Answer & Solution

Correct Answer

(A) the neuromuscular junction

Step-by-step Solution

Detailed explanation

(a) : A neuron that transmits a stimulus to muscle tissue is called motor neuron. A motor unit consists of a single motor neuron (nerve cell) and the muscle fibres it innervates. The portion of the muscle plasma membrane (sarcolemma) that lies beneath the nerve endings (axon terminals) is called the motor end plate. The axon terminals and the motor end plate together constitute the neuromuscular junction or neuromotor junction.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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