Question

Which of the following shows correct sequence of conduction of action potential in the heart?

• A. SA node $\to$ Bundle of His $\to$ AV node $\to$ Right and left branches of bundle of His $\to$ Purkinje fibre
• B. SA node $\to$ AV node $\to$ Purkinje fibre Bundle of His $\to$ Right and left branches of bundle of His
• C. SA node $\to$ AV node $\to$ Bundle of His $\to$ Right and left branches of bundle of His $\to$ Purkinje fibre
• D. AV node $\to$ SA node $\to$ Bundle of His $\to$ Right and left branches of bundle of His $\to$ Purkinje fibre

Answer 1

The correct option is A SA node $\to$ Bundle of His $\to$ AV node $\to$ Right and left branches of bundle of His $\to$ Purkinje fibre

The conduction system of the heart. Left: Normal excitation originates in the sinoatrial (SA) node then propagates through both atria. The atrial depolarization spreads to the atrioventricular (AV) node, and passes through the bundle of His to the bundle branches/Purkinje fibers.