Vagal Stimulation on the Heart

Question

Vagal stimulation on the heart
A) increases the force of myocardial contraction.
B) increases the amount of blood that flows into the heart from the vena cava.
C) causes tachycardia.
D) slows the heart rate.

Accepted Answer

Vagal stimulation on the heart, also known as the parasympathetic nervous system, slows down the heart rate. This is because it releases the neurotransmitter acetylcholine, which acts on the SA node to decrease its firing rate and ultimately slow down the heart rate.