Where are the semilunar valves located in the heart?

The semilunar valves are located at the exits of the right and left ventricles, where they regulate blood flow from the heart into the major arteries. Specifically, the right semilunar valve, also known as the pulmonary valve, is situated at the exit of the right ventricle and opens into the pulmonary trunk. The left semilunar valve, or aortic valve, is located at the exit of the left ventricle and opens into the aorta.

This strategic positioning allows these valves to prevent backflow into the ventricles after contraction, ensuring that blood flows efficiently into the pulmonary circulation and systemic circulation. Understanding the exact locations and functions of these valves is crucial when studying the cardiovascular system and how it maintains effective circulation throughout the body.