What is the correct sequence of cardiac electrical activity?

Answer 1

The impulses from SA node spread through out the atrial musculature in about 0.09 seconds, and parallel to it, the impulses also reach the AV node. From AV node, after a delay of about 0.12 seconds they pass to the inter ventricular septum through the Bundle of His, which soon divides into Left and Right Bundle branch and ultimately into the Purkinje fibers which first depolarize the endocardium of the ventricles and then the rest of ventricular musculature.

SA Node --> Atria, AV node --> Bundle of His --> Right & Left Bundle Branches --> Purkinje fibers

Answer 2

The correct sequence of cardiac electrical activity is: 1. SA node (sinoatrial node) generates an electrical impulse. 2. Impulse spreads through the atria, causing them to contract. 3. AV node (atrioventricular node) delays the impulse briefly to allow the ventricles to fill. 4. Impulse travels down the bundle of His and Purkinje fibers to the ventricles, causing them to contract.

Answer 3

SA node, AV node, AV bundle, Purkinje fibers