From the SA node, an electrical impulse is sent throughout the left and right atrias causing them to contract and force the blood into the ventricles.

SA node: The SA node (SA stands for sinoatrial) is one of the major elements in the cardiac conduction system, the system that controls the heart rate.

The sinoatrial (SA) node is a section of nodal tissue that is located in the upper wall of the right atrium. The SA node is also referred to as the pacemaker of the heart.

In the upper part of the right atrium of the heart is a specialized bundle of neurons known as the sinoatrial node (SA node).

The sinoatrial node (also commonly spelled sinuatrial node , abbreviated SA node or SAN , also called the sinus node ) is the impulse-generating (pacemaker) tissue located in the right atrium of the heart, and thus the generator of sinus rhythm. It is a group of cells positioned...

Cells within the sinoatrial (SA) node are the primary pacemaker site within the heart.

Slide 20 Sino-atrial Node; The SA Node surrounds the nodal artery from which it receives a rich blood supply.

Sinoatrial Node (SA node) ... Location The sinoatrial node (SA node) consists of a cluster of specialized cells that have pacemaker activity (automaticity).

This point is called the atrioventricular node. Therefore, the electrical impulse from the atrium must pass through this point to reach the ventricle.

The canine isolated sinoatrial node preparation was cross circulated with arterial blood of a support dog. The sinoatrial rate of the preparation was 96 ± 5 beats/min (n = 16) at control.