PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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True
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False
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Either A or B
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None of the above
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Detailed explanation-1: -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.
Detailed explanation-2: -The axon terminal of a motor neuron “connects” with the muscle fiber at a place called the neuromuscular junction|], (In general, a motor neuron and the muscle fibers under its control are called a motor unit.)
Detailed explanation-3: -The process of muscle contraction begins at the site where a motor neuron’s terminal meets the muscle fiber-called the neuromuscular junction (NMJ). Every skeletal muscle fiber in every skeletal muscle is innervated by a motor neuron at a NMJ.