What is the job of valves in the heart?

Valves in the heart serve the critical function of ensuring unidirectional blood flow through the heart's chambers and into the arteries. They open and close in response to pressure changes, preventing the backflow of blood and maintaining efficient circulation. There are four main valves: the tricuspid and mitral valves regulate blood flow between the atria and ventricles, while the pulmonary and aortic valves control blood flow out of the ventricles into the lungs and body, respectively. This coordinated action is essential for effective heart function and overall cardiovascular health.