Alpha Motor Neurons in the Spinal Cord Communicate with Muscle

Multiple Choice

Alpha motor neurons in the spinal cord communicate with muscle fibers by releasing the neurotransmitter acetylcholine,which influences muscle activity by

A) depolarizing neurons in the peripheral nervous system.
B) directly causing muscle contractions.
C) hyperpolarizing peripheral motor neurons.
D) inhibiting neurons in the dorsal root of the spinal cord.