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Discuss the structure and function of neuromuscular junction

      

Discuss the structure and function of neuromuscular junction

  

Answers

Martin
The nervous system 'communicates' with muscle via neuromuscular (also called myoneural) junctions. These junctions work very much like a synapse between neurons.

The impulse arrives at the end bulb, chemical transmitter is released from vesicles (each of which contains 5,000 - 10,000 molecules of acetylcholine) and diffuses across the neuromuscular cleft, the transmitter molecules fill receptor sites in the membrane of the muscle & increase membrane permeability to sodium, sodium then diffuses in & the membrane potential becomes less negative, and, if the threshold potential is reached, an action potential occurs, an impulse travels along the muscle cell membrane, and the muscle contracts. Some muscles (skeletal muscles) will not contract unless stimulated by neurons; other muscles (smooth & cardiac) will contract without nervous stimulation but their contraction can be influenced by the nervous system. Thus, the nervous and muscle systems are closely interconnected

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marto answered the question on April 16, 2019 at 07:57

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