Which of the following is an effect of parasympathetic activity to the heart?
A) SA nodal cells are depolarized.
B) Heart rate is increased.
C) cAMP is activated.
D) The rate of spontaneous depolarization in SA nodal cells decreases.
E) Postganglionic neurons release acetylcholine, which binds to nicotinic cholinergic receptors in the SA node.

Question

Quizplus · Accepted Answer

The parasympathetic nervous system, through the release of acetylcholine, slows the heart rate by decreasing the rate of spontaneous depolarization in SA nodal cells, which is opposite to the sympathetic nervous system that increases heart rate.

Which of the Following Is an Effect of Parasympathetic Activity