The basic rhythm of the heartbeat is set by the ______.
A) AV node
B) EKG
C) SA node
D) "fight-or-flight" hormone

Question

Quizplus · Accepted Answer

The basic rhythm of the heartbeat is set by the SA (sinoatrial) node, which is located in the right atrium of the heart. The SA node acts as the natural pacemaker of the heart, initiating each heartbeat and setting the heart rate. The AV (atrioventricular) node helps to coordinate the contraction of the atria and ventricles, but it does not set the basic rhythm of the heartbeat. The EKG (electrocardiogram) is a tool used to measure the electrical activity of the heart, but it does not set the rhythm. The "fight-or-flight" hormone (epinephrine) can increase the heart rate and contractility, but it does not set the basic rhythm of the heartbeat.

The Basic Rhythm of the Heartbeat Is Set by the ______