How Do Electrical Impulses Travel Through the Heart?
After an electrical impulse is generated in the SA node, it travels through the atria, causing them to contract and push blood into the ventricles. The impulse then reaches the atrioventricular (AV) node, which delays the signal slightly to ensure that the ventricles have enough time to fill with blood. From the AV node, the impulse travels through the bundle of His, right and left bundle branches, and finally through the Purkinje fibers, causing the ventricles to contract.
