Pharmacology Which one of the following sites is characterized by adrenergic neurohumoral transmission? A Parasympathetic preganglionic fibers B Sympathetic postganglionic fibers C Sympathetic fibers in the adrenal medulla D Synaptic fibers in the ecrine gland 💡 Explanation Which one of the following sites is characterized by adrenergic neurohumoral transmission? ✓ Correct Answer: C. Sympathetic fibers in the adrenal medulla