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.

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands