When epinephrine and norepinephrine are released into the bloodstream,they are called hormones instead of neurotransmitters.

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Quizplus · Accepted Answer

Epinephrine and norepinephrine can function as neurotransmitters in the nervous system and as hormones when released into the bloodstream. The distinction between whether they are called neurotransmitters or hormones depends on how they are released and the mode of action in the body. When they are released by neurons to signal within the nervous system, they are neurotransmitters. When they are released by the adrenal glands to affect the body's physiological response to stress, they are hormones.

When Epinephrine and Norepinephrine Are Released into the Bloodstream,they Are