What is a muscle made up of?

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Multiple Choice

What is a muscle made up of?

Explanation:
Muscles are organized as motor units—the functional building blocks of contraction. Each motor unit is a single alpha motor neuron in the anterior horn of the spinal cord and all the muscle fibers it innervates. A muscle contains hundreds of these motor units, so it isn’t just one unit or nerve endings alone; it’s a complex blend of many motor units working together. This arrangement lets the muscle generate varying force by recruiting more or fewer motor units as needed.

Muscles are organized as motor units—the functional building blocks of contraction. Each motor unit is a single alpha motor neuron in the anterior horn of the spinal cord and all the muscle fibers it innervates. A muscle contains hundreds of these motor units, so it isn’t just one unit or nerve endings alone; it’s a complex blend of many motor units working together. This arrangement lets the muscle generate varying force by recruiting more or fewer motor units as needed.

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