The motor unit is composed of the motor neuron and innervated fibers, which are the ones that contract. 1) motor unit 2) contract.
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What is the motor unit?</h3>
The<u> motor unit</u> is the association between the motor neuron and a group of fibers from the muscle.
A single muscle is composed of several motor units. But the fibers involved in only one motor unit are just a little part of the whole muscle mass, meaning this is the part that will contract.
The motor unit is the basic unit from which the CNS controls motion.
Before contraction, there must be a stimulus that is received by receptors.
The CNA sends a message to respond to the stimulus.
The message is transmitted, by motor neurons, as chemical signals -neurotransmitters- which are received by the muscle fibers.
When the muscle cells receive this information, a cascade of events occurs that produce the local contraction of these fibers.
You can learn more about the motor unit at
brainly.com/question/18523459
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