PHYSIOLOGY
NEUROMUSCULAR JUNCTION TRANSMISSION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Neurotransmitter
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Acetylcholine
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Synaptic cleft
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Neuromuscular Junction
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Detailed explanation-1: -EXPLANATION: The junction between a motor neuron and the sarcolemma of the muscle fibre is called the motor end plate.
Detailed explanation-2: -Embedded in the sarcolemma (= fiber membrane) at the neuromuscular junction are (nicotinic) receptors for acetylcholine (ACh). This is the neurotransmitter that is released by the terminal branches of a motor neuron. An enlargement of an ACh receptor reveals that it is composed of five (5) polypeptide subunits.
Detailed explanation-3: -Each motor neuron ending sits very close to a muscle fibre. Where they sit together is called a neuromuscular junction. The motor neurons release a chemical, which is picked up by the muscle fibre. This tells the muscle fibre to contract, which makes the muscles move.