In the bloodstream, norepinephrine is active as a(n) __________.
A) neurotransmitter
B) hormone
C) endorphin
D) both a and b

Name: In the bloodstream, norepinephrine is active as a(n) __________. A) neurotransmitter B) hormone C) endorphin D) both a and b
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Norepinephrine functions as a hormone when released into the bloodstream by the adrenal glands. While it can also act as a neurotransmitter in the nervous system, the question specifically asks about its activity in the bloodstream.

In the Bloodstream, Norepinephrine Is Active as A(n) __________