PHYSIOLOGY
GENERAL PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the following motor units would allow for greater, more precise, muscular control?
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A motor unit made up of a motor neuron and 5 muscle fibers.
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A motor unit made up of a motor neuron and 10 muscle fibers.
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A motor unit made up of a motor neuron and 20 muscle fibers.
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A motor unit made up of a motor neuron and 100 muscle fibers.
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A motor unit made up of a motor neuron and 1000 muscle fibers.
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Explanation:
Detailed explanation-1: -The number of muscle fibers within each unit can vary within a particular muscle and even more from muscle to muscle: the muscles that act on the largest body masses have motor units that contain more muscle fibers, whereas smaller muscles contain fewer muscle fibers in each motor unit.
Detailed explanation-2: -Motor units that have a high ratio of muscle fibers to motor neurons are more capable of precise movement. The “all or none principle of muscular contraction” states that if the stimulus to a motor unit is at threshold, all the fibers in that motor unit will contract maximally.
There is 1 question to complete.