Patient Care Technician (PCT) AAH Practice Exam

What is another name for the S-A node?

1. Cardiac Conductor

2. Pacemaker

3. Cardiac Regulator

4. Atrial Node

The correct answer is: Pacemaker

The S-A node, or sinoatrial node, is often referred to as the pacemaker of the heart. This is because it plays a crucial role in initiating the electrical impulses that regulate the heartbeat. The S-A node generates these impulses at regular intervals, which then travel through the heart, causing it to contract and pump blood effectively. By setting the rhythm for the heart, the S-A node effectively controls the heart rate, ensuring it beats in a coordinated and timely manner. The term pacemaker accurately reflects its function and importance in maintaining the heart's rhythm. Other terminology, such as cardiac conductor or atrial node, does not convey the specific role that the S-A node has in initiating the heartbeat, while cardiac regulator suggests a broader function that does not specifically point to the node’s role as the primary source of electrical impulses. Therefore, referring to the S-A node as the pacemaker is both accurate and widely accepted in medical terminology.