CDH Paramedic Entrance Practice Exam 2026 - Free Paramedic Entrance Practice Questions and Study Guide

Oxygenated blood returns to the heart after passing through the lungs via the pulmonary veins, which empty into the left atrium. This is a crucial part of the circulatory process. After blood is oxygenated in the lungs, it must travel back to the heart to be pumped throughout the body. The left atrium serves as the receiving chamber for this freshly oxygenated blood before it moves into the left ventricle, from which it will be distributed to the rest of the body. Understanding this flow is key in comprehending how the heart and lungs work together to ensure that oxygen-rich blood is supplied to the body effectively.