When One Motor Neuron Fires a Single Action Potential the Result

Question

When one motor neuron fires a single action potential the result affects one ________.
A) upper motor neuron
B) synaptic cleft
C) lower motor neuron
D) motor unit
E) sensory unit

Accepted Answer

When one motor neuron fires a single action potential, the result affects one motor unit. A motor unit consists of a single motor neuron and all the muscle fibers it innervates. When the motor neuron fires an action potential, all the muscle fibers in its associated motor unit contract together.