Question

Referring to the conduction system of the heart, the pacemaker is located in the

a. bundle branches.
b. AV node.
c. SA node.
d. Purkinje fibers.

Answer 1

The pacemaker of the heart is located in the SA node, which generates electrical impulses that cause the heart to beat and initiates a cascade of electrical signals throughout the heart.

Step-by-step explanation:

The pacemaker of the heart is located in the SA node. The SA node, or sinoatrial node, is a small group of specialized myocardial cells located near the wall of the right atrium. It generates electrical impulses that cause the heart to beat by initiating a cascade of electrical signals throughout the heart.

These electrical signals flow from the SA node to the AV node, which then transmits the impulses to the atrioventricular bundle, the bundle branches, and finally to the Purkinje fibers. The Purkinje fibers distribute the impulse throughout the ventricles, causing them to contract and pump blood.