Motor Units Are the Functional Unit of Movement

Multiple Choice

Motor units are the functional unit of movement. What composes a motor unit?

A) The motor cortex, spinal cord, and muscle
B) The motor cortex, cerebellum, spinal cord, and muscle
C) Either an alpha or gamma neuron and all the muscle fibers they innervate
D) An alpha motor neuron and all the muscle fibers it innervates