What is SA node?

Some articles on sa, node, sa node:

Tedisamil - Molecular Problem
... an electrical impulse from the sinoatrial (SA) node is distributed rapidly throughout the atria causing coordinated excitement and inactivation of atrial muscle cell ion channels resulting in ... During fibrillation, other electrical signals overwhelm the SA node and ion channel excitement is no longer uniform throughout the atria ... Subsequent action potentials from the SA node will not be able to uniformly excite the muscle as not all of the channels will be available to open as ...
Sinus Rhythm - Cardiac Conduction System and Pathway
... The initial impulse originates in the sinoatrial (SA) node, or sinus node, which is located in the upper right atrium of the heart ... The SA node is designated as the pacemaker of the heart ... From the SA node, the electrical impulse spreads through interatrial tracts that spread the electrical impulse through the right and left atria and ...
Sinoatrial Block
... The initial impulse in a heart is usually formed in the Sinoatrial (SA) node and carried through the atria, down the internodal atrial pathways, and to the Atrioventricular (AV) node ... In an SA block, the electrical impulse is delayed or blocked on the way to the atria, thus delaying atrial depolarization ... This is different from an AV block which occurs in the AV node and delays ventricular depolarization ...