All of the following are true of the SA node EXCEPT that it
A) directly stimulates the atria.
B) directly stimulates the ventricles.
C) is the pacemaker.
D) is influenced by nerve impulses and hormones.

Question

Quizplus · Accepted Answer

The SA node (sinoatrial node) is responsible for setting the pace of the heart and initiates the heartbeat by causing the atria to contract. However, it does not directly stimulate the ventricles. The impulse from the SA node is transmitted to the ventricles through the AV node (atrioventricular node) and the bundle of His.

All of the Following Are True of the SA Node