A motor unit is Group of answer choices 1. many myofibrils in a sarcolemma. 2. many motor end plates at a neuromuscular junction. 3. a motor neuron and the muscle fibers connected to it. the functional unit of a muscle fiber. 4. a type of recreational vehicle.

A motor unit is a group of MOTOR NEURON and the MUSCLE FIBERS connected to it.

Explanation:

Neuron is the structural and functional unit of nervous system.

Motor unit consists of a motor neuron and the skeletal muscles innervated by the terminals of the neuron.

Several associated motor units called motor pool coordinates together the contractions of a single muscle.

That is, the activation of a motor unit leads to the contraction of all the muscle fibers attached to it.

carbohydrates are the body's preferred source of energy.

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