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Aug 21, 2025

DAT Question of the Day – High Yield Bio

The release of epinephrine from the chromaffin granules of the adrenal medulla into the bloodstream in response to neural stimulation is mediated by which of the following?

A) Acetylcholine
B) GABA
C) Cortisol
D) Dopamine
E) Serotonin

Drop your answer below, or check the spoiler for an explanation!

Spoiler:
Answer: A) Acetylcholine
Acetylcholine binds to nicotinic receptors on chromaffin cells, triggering the release of epinephrine (“adrenaline rush”) for the fight-or-flight response.

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