Also called the heart's natural pacemaker; where the electrical signal in the heart begins.
small area of specialized heart tissue located in the right atrium that conducts impulses through the right and left atria, signaling these chambers to contract and pump blood into the ventricles
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. This stunningly designed system generates electrical impulses and conducts them throughout the muscle of the heart, stimulating the heart to contract and pump blood. See the entire definition of SA node
A cluster of special muscle fibers located in the right atrial wall of the heart considered to be the primary pacemaker of the heart. It normally generates regular electrical impulses that cause the heart muscle to contract.