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Solution


Q.

Stimulation of a muscle fibre by a motor neuron occurs at            [2014]
1 the neuro-muscular junction  
2 the transverse tubules  
3 the myofibril  
4 the sarcoplasmic reticulum  

Ans.

(1)

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 neuro-muscular junction or neuromotor junction.