Certified Rhythm Analysis Technician (CRAT) Practice Exam 2025 - Free CRAT Practice Questions and Study Guide

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What are the phases of the cardiac conduction system, and what action occurs in the heart during each phase?

Systole- relaxation; diastole- contraction

Conduction- contraction; circulation- relaxation

Systole- contraction; diastole- relaxation

The phases of the cardiac conduction system are vital for understanding the mechanics of the heart during the cardiac cycle. The correct answer highlights that systole refers to the phase of contraction, during which the heart muscles contract to pump blood out of the heart chambers, specifically from the ventricles to the arteries.

Conversely, diastole refers to the relaxation phase, where the heart muscles relax, allowing the chambers to fill with blood from the atria before the next contraction. This cyclical pattern of contraction and relaxation is crucial for maintaining effective circulation throughout the body.

Understanding these terms is essential for analyzing heart function, diagnosing cardiac conditions, and monitoring the overall health of the cardiovascular system.

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Relaxation- heart resting; contraction- heart contracting

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