A Chemical Signal That Has Both Endocrine and Neural Roles

Question

A chemical signal that has both endocrine and neural roles is
A) parathyroid hormone.
B) calcitonin.
C) epinephrine.
D) acetylcholine.
E) ecdysone.

Accepted Answer

Epinephrine is both a hormone released by the adrenal gland in response to stress and a neurotransmitter released by sympathetic neurons to activate the fight or flight response.