Each heart beat or contraction is initiated by generation of an action potential in the SA node; the electrical impulse spreads over both atria, causing them to contract, and on to the atrioventricular (AV) node. From the AV node it spreads through the bundle of His and down the Purkinje ...
The action of the AV node is regulated by SA node. Role SA node acts as a pacemaker. AV node acts as a pacesetter. Summary – SA node vs AV node The SA node and AV node are two main nodes present in the human heart. The SA node generates cardiac action potential due to spontaneo...