EKG National Practice Exam 2025 – Complete Study Guide

The heart has four main valves that regulate blood flow through its chambers and into the major arteries. These valves are essential for ensuring unidirectional flow and preventing backflow as blood moves through the heart. The four valves are the tricuspid valve, the pulmonary valve, the mitral valve, and the aortic valve.

The tricuspid valve is located between the right atrium and the right ventricle, controlling blood flow from the atrium to the ventricle. The pulmonary valve sits at the entrance of the pulmonary artery, allowing blood to flow from the right ventricle to the lungs for oxygenation. The mitral valve, found between the left atrium and left ventricle, facilitates blood flow from the atrium to the ventricle. Finally, the aortic valve regulates blood flow from the left ventricle into the aorta, supplying oxygenated blood to the body.

Each of these valves plays a critical role in the cardiac cycle, and their coordinated functions are vital for efficient blood circulation. Understanding the importance and function of each valve helps in comprehending the overall mechanics of the heart and the circulatory system.