In the communication link between a motor neuron and a skeletal muscle,
A)the motor neuron is considered the presynaptic cell and the skeletal muscle is the postsynaptic cell.
B)the motor neuron is considered the postsynaptic cell and the skeletal muscle is the presynaptic cell.
C)action potentials are possible on the motor neuron but not the skeletal muscle.
D)action potentials are possible on the skeletal muscle but not the motor neuron.
E)the motor neuron fires action potentials but the skeletal muscle is not electrochemically excitable.

Question

Quizplus · Accepted Answer

In the synaptic connection between a motor neuron and a skeletal muscle, the motor neuron is considered the presynaptic cell, and the skeletal muscle is considered the postsynaptic cell. The presynaptic motor neuron releases acetylcholine (ACh) at the neuromuscular junction, which binds to receptors on the postsynaptic muscle fiber, resulting in depolarization and contraction of the muscle fiber. Action potentials can occur on both the presynaptic motor neuron and the postsynaptic skeletal muscle.

In the Communication Link Between a Motor Neuron and a Skeletal