The components of the cardiac conduction system are the sinoatrial node, internodal pathways, atrioventricular node, AV bundle (Bundle of His), bundle branches, and Purkinje fibers. These components work together to coordinate the contraction of the heart chambers. Option 4 is correct.
The components of the cardiac conduction system include the sinoatrial (SA) node, internodal pathways, atrioventricular (AV) node, AV bundle (Bundle of His), right and left bundle branches, and Purkinje fibers.
The SA node initiates the action potential, which spreads across the atria. After reaching the AV node, there is a short delay that allows the atria to complete pumping blood before the impulse is transmitted to the AV bundle. The impulse travels through the AV bundle and bundle branches to the Purkinje fibers, which conduct the impulse to the ventricular myocardium, causing the ventricles to contract.
Overall, the cardiac conduction system ensures the coordinated contraction of the heart chambers, allowing effective pumping of blood throughout the body.
Hence, 4. is the correct option.