Q: What is the correct pathway for the propagation of the cardiac impulse?  

Answer: C

The SA (sinoatrial) node, located in the right atrium, is known as the natural pacemaker of the heart, as it initiates the electrical impulse that leads to the contraction of the heart. From the SA node, the impulse spreads across the atria, causing them to contract. The impulse then reaches the AV (atrioventricular) node, which is located between the atria and ventricles. The AV node delays the impulse slightly to allow the atria to complete their contraction before the impulse is transmitted to the ventricles.
After the AV node, the impulse travels along the Bundle of His, which divides into the right and left bundle branches that extend down into the ventricles. The Purkinje fibers are specialized muscle fibers that rapidly transmit the electrical impulse throughout the ventricles, causing them to contract in a coordinated manner.
Therefore, the correct pathway for the propagation of the cardiac impulse is from the SA node to the AV node, then to the Bundle of His, and finally to the Purkinje fibers.

Click me to Read more Question & Answer of Cardiovascular system

---

Share this MCQ