Alpha motor neurons in the spinal cord communicate with muscle fibers by releasing 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.

Question

Quizplus · Accepted Answer

Acetylcholine directly causes muscle contractions by binding to receptors on the muscle fibers, which leads to the activation of intracellular signaling pathways that result in muscle contraction.

Alpha Motor Neurons in the Spinal Cord Communicate with Muscle