Final answer:
The primary function of the AV valves and semilunar valves in the heart is to regulate blood flow and prevent backflow.
Step-by-step explanation:
The role of AV valves and semilunar valves in the heart
The primary function of the atrioventricular (AV) valves and semilunar valves in the heart is to regulate the flow of blood through the heart and prevent the backflow of blood.
The AV valves, including the tricuspid valve and mitral valve, separate the atria from the ventricles and prevent blood from moving from the ventricles back to the atria. The semilunar valves, including the aortic valve and pulmonary valve, are found in the arteries leaving the heart and prevent blood from flowing back from the arteries to the ventricles.