What is the function of the chordae tendineae?

The chordae tendineae are fibrous strings that connect the papillary muscles to the cusps of the atrioventricular valves in the heart. Their main function is to prevent the valves from prolapsing or reversing into the atria when the ventricles contract during systole. This helps maintain the tight seal of the valves and ensures proper blood flow through the heart chambers. The chordae tendineae also help to regulate the flow of blood by opening and closing the valves at the appropriate times during the cardiac cycle. Overall, they play a crucial role in maintaining the efficiency and effectiveness of the heart's pumping action.