JBL Cardiology Practice Test 2025 – Complete Exam Prep Guide

Question: 1 / 400

What is the significance of the SA node in heart function?

It acts as a valve controlling blood flow

It generates the heart's rhythm

The significance of the SA node, or sinoatrial node, in heart function lies in its role as the primary pacemaker of the heart. The SA node generates electrical impulses that initiate each heartbeat, effectively setting the rhythm for the entire heart. This intrinsic electrical activity stimulates the atria to contract and push blood into the ventricles. The regular firing of the SA node controls the heart rate and ensures that the heart beats in a coordinated manner, which is essential for efficient blood flow throughout the body.

Without the SA node effectively generating these impulses, the heart would not beat in a synchronized fashion, leading to potential arrhythmias or other cardiac dysfunctions. The other options describe functions that do not relate to the primary role of the SA node in coordinating electrical activity in the heart.

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It provides oxygen to heart tissue

It absorbs excess calcium

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