When acetylcholine is released,it causes the heart rate to:
A) slow and atrioventricular conduction rates to increase.
B) increase and atrioventricular conduction rates to increase.
C) slow and atrioventricular conduction rates to slow.
D) increase and atrioventricular conduction rates to slow.

Question

Quizplus · Accepted Answer

Acetylcholine, when released, generally has an inhibitory effect on the heart. It causes the heart rate to slow down (a process known as bradycardia) and also slows the atrioventricular (AV) conduction rates. This is primarily due to its action on the muscarinic receptors in the heart.

When Acetylcholine Is Released,it Causes the Heart Rate To