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Motor neurons and the muscle fibers they transmit signals to
A motor unit is a collection of muscle fibers that contract as a single functional unit when stimulated by an impulse from a motor neuron. The actual size can vary greatly, from many large muscle fibers in the quadriceps muscle group per motor unit to just a few muscle fibers in the muscles of the fingers per motor unit.

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9y ago
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9y ago

a neuron and all of the skeletal muscle fibers that it stimulates.
several muscle fibers and one motor neuron
A single motor neuron and all the skeletal muscle fibers it innervates constitute a motor unit.
a muscle spindle and all the muscle fibers it innervates

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14y ago

a motor unit is made up of a single motor neuron as well as of the muscle fibers that neuron activates.

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Q: What is a motor unit is made up of?
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One neuron and all the skeletal muscle cells it stimulates make up one?

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There is no 'multi motor unit' to be different from a single motor unit!A single motor unit is all the muscle fibers controlled by a single motor neuron.Multiple motor unit summation is when a smooth and steady increase in muscle tension is produced by increasing the number of active single motor units.Notice that what's being described is not something having to do with a some non-existent thing called a 'multi motor unit', but rather is a summation of many active singlemotor units.


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