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

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

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explanation:

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