The heart naturally slows when responding to
A)acetylcholine.
B)epinephrine.
C)endorphin.
D)nitric oxide.
E)GABA.

Question

Quizplus · Accepted Answer

Acetylcholine is released by the parasympathetic nervous system, which is responsible for slowing down the heart rate. This is known as the "rest and digest" response, as opposed to the sympathetic "fight or flight" response, which is responsible for increasing heart rate and other physiological responses. Epinephrine, on the other hand, is released by the sympathetic nervous system and increases heart rate. Endorphins, nitric oxide, and GABA are not directly involved in regulating heart rate.

The Heart Naturally Slows When Responding to