Parasympathetic Nerves Release the Neurotransmitter _______, Which Slows the Heart

Question

Parasympathetic nerves release the neurotransmitter _______, which slows the heart.
A) epinephrine
B) norepinephrine
C) acetylcholine
D) beta blocker

Accepted Answer

Parasympathetic nerves release acetylcholine, which slows the heart rate. The other options, epinephrine, norepinephrine, and beta blockers, are all involved in the sympathetic nervous system and have the opposite effect of increasing heart rate.