PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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One neuron and all the skeletal muscles it stimulates is known as a ____ (pg. 189)
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sarcoplasmic reticulum
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motor unit
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synaptic cleft
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neuromuscular junction
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Explanation:
Detailed explanation-1: -motor unit is a motor neuron plus all the skeletal muscle fibers it stimulates. Motor units are therefore the most basic unit of a skeletal muscle and are what causes a contraction. Motor units can be very large, innervating over 1000 fast-twitch fibers in places like the quadriceps muscles.
Detailed explanation-2: -Motor unit is the functional segment of skeletal muscles. A motor unit contains two main components: a single different motor neuron (it is a neuron that carries signals away from the central nervous system) and all the muscle fibres. Motor unit is made up of a single neuron that makes a group of skeletal muscles.
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