Q: Which of the following is true regarding the electrical impulses in the heart?
A		The atrioventricular (AV) node initiates the heartbeat.
B		Purkinje cells in the ventricles control the heart rate.
C		The sinoatrial (SA) node is located in the left atrium of the heart.
D		By stimulating the vagus nerve, the parasympathetic nervous system can decrease the rate at which electrical impulses are generated.

Circulatory System | Nervous System |