MedCa Electrocardiogram (EKG) Practice Exam 2026 - Free EKG Practice Questions and Study Guide

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Which part of the heart receives oxygenated blood from the lungs?

Left ventricle

Right atrium

Right ventricle

Left atrium

The left atrium is the part of the heart that receives oxygenated blood from the lungs. Blood returning from the lungs, where it has picked up oxygen through the process of respiration, enters the left atrium via the pulmonary veins. This is a crucial step in the circulatory process, as it allows oxygen-rich blood to be channeled into the left ventricle, which then pumps it out to the rest of the body.

Understanding the function of the left atrium is essential for grasping how oxygenated and deoxygenated blood circulate through the body and emphasizes the compartmentalization within the heart, where the left side handles oxygenated blood and the right side deals with deoxygenated blood.