Choose one of the following three diagrams. Specify your choice here:_ (a, b, or c). Identify the system(s) your diagram represents, and the parts associated with that system.

b. Motor Unit

Explanation:

A motor unit is consist of motor neuron and muscles fibers connected through the axon terminal of neuron. Motor unit function for the movement (contraction and relaxation) of muscles.

A neuron is connected with muscles fiber through the axon terminal of neuron and is called neuromuscular junction. Skeletal muscle fiber is consist of a cylindrical muscle cell that contain microfibrils which participate in contraction and relaxation of muscles.

Neuron and muscle fiber coordinate with other other for the proper functioning of motor unit.

Hence, I selected diagram "b" that represents motor unit.

i believe the correct answer is d