Which one of the following sites is characterized by adrenergic neurohumoral transmission?
The term neurohumoral means "nerve-blood." The only site in the ANS where neurohumoral transmission occurs is the adrenal medulla, where sympathetic nerve activity elicits the release of catecholamines into the blood.
Parasympathetic preganglionic fibers
Sympathetic postganglionic fibers
Sympathetic fibers in the adrenal medulla
Synaptic fibers in the ecrine gland
A.N.S.