Norepinephrine and epinephrine are considered to be_____ when released into the bloodstream, but ______ when released at synapses.
A) hormones; neurotransmitters
B) neuropeptides; neurohormones
C) neuropeptides; neurotransmitters
D) neurotransmitters; hormones
E) neurotransmitters; neuropeptides

Question

Quizplus · Accepted Answer

Norepinephrine and epinephrine act as hormones when released into the bloodstream by the adrenal glands, affecting various organs. When released at synapses in the nervous system, they function as neurotransmitters, transmitting signals between neurons.

Norepinephrine and Epinephrine Are Considered to Be_____ When Released into the Bloodstream