A motor unit is defined as an axon and all of the: 1. muscle fibers that the branches contact 2. sarcomeres that its dendrites 3. contact fascicle that the branches contact.

Correct answer is Option 1. muscle fibers that the branches contact.

Explanation:

A motor unit is made up a motor neuron also known as an axon and the number of muscle fibers that the branches have contact with.

Motor units function in such a way that they organise the contractions of one muscle when they receive a signal from the brain.

Motor units can come in

a. Large sizes : an example is the muscle in the limbs

b. Small sizes: an examples is the muscle in the eyes

the answer is: metamorphic rocks often show the presence of fossils, also a

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-lavira: )