Question: All somatic motor neurons produce __________.both epinephrine and norepinephrineonly norepinephrineonly acetylcholineboth acetylcholine and norepinephrine

Answer: only acetylcholineSomatic motor neurons activate skeletal muscle fibers at neuromuscular junctions via the neurotransmitter acetylcholine.

Question: Autonomic motor neurons __________.innervate skeletal muscleare typically heavily myelinatedutilize a two-neuron chain to reach their effectorsrelease only acetylcholine

Answer: utilize a two-neuron chain to reach their effectorsAutonomic neural pathways utilize two neurons, a preganglionic neuron and a postganglionic neuron, to reach their effector.

Question: Autonomic nerve fibers that increase heart rate, elevate blood pressure, induce dry mouth, and increase sweating do so primarily through the secretion of __________.both acetylcholine and epinephrinenorepinephrineonly acetylcholineonly epinephrine

Answer: norepinephrineSympathetic fibers primarily release norepinephrine, which can have an excitatory or inhibitory effect.

Question: Myelination tends to be heaviest on which types of neurons?parasympathetic preganglionic neuronsparasympathetic postganglionic neuronssympathetic preganglionic neuronssomatic motor neurons

Answer: somatic motor neuronsSomatic motor neurons, those that activate skeletal muscles, are heavily myelinated.