PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the sequence of a motor unit signal travelling from the brain to the muscle?
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Synapse, axon, cell body, dendrite, motor end plate
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Synapse, dendrite, cell body, axon, motor end plate
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Motor end plate, dendrite, cell body, axon, synapse
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Synapse, dendrite, axon, cell body, motor end plate
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Explanation:
Detailed explanation-1: -The recruitment sequence is thought to begin with type I motor units analogous to type S units, to progress to type II units that first include type FR (type IIa), and to end with units analogous to type FF (type IIb), which are active only at relatively high force output.
Detailed explanation-2: -The upper and lower motor neurons form a two-neuron circuit. The upper motor neurons originate in the cerebral cortex and travel down to the brain stem or spinal cord, while the lower motor neurons begin in the spinal cord and go on to innervate muscles and glands throughout the body.
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