In the adrenal medullae, cells that are not innervated by sympathetic postganglionic fibers are affected by circulating levels of ________ if they possess receptors for these molecules.
A) dopamine
B) acetylcholine and serotonin
C) serotonin
D) dopamine and epinephrine
E) epinephrine and norepinephrine

Question

Quizplus · Accepted Answer

The adrenal medullae secrete epinephrine and norepinephrine into the circulation, which can affect cells that possess receptors for these molecules, even if they are not innervated by sympathetic postganglionic fibers. Therefore, the best choice is E.

In the Adrenal Medullae, Cells That Are Not Innervated by Sympathetic