What allows blood flow between the chambers?

Blood flow between the chambers of the heart is facilitated by a series of valves that open and close in response to pressure changes during the cardiac cycle. The atrioventricular valves (tricuspid and mitral) allow blood to flow from the atria to the ventricles, while the semilunar valves (pulmonary and aortic) control blood flow from the ventricles to the pulmonary artery and aorta, respectively. This coordinated movement ensures unidirectional blood flow through the heart, optimizing circulation throughout the body.