What is the function of pulmonary semilunar valve?

Pulmonary semilunar valve is a valve that controls the flow of blood from the heart (specifically, the pulmonary trunk) to the lungs. It is located at the opening of the pulmonary trunk and is made of three cusps of connective tissue.

Pulmonary semilunar valve performs the following functions:

- Allows the passage of deoxygenated blood from the heart to the lungs during ventricular systole.

- Prevents the backflow of blood into the heart during ventricular diastole.

- Ensures unidirectional blood flow from the right ventricle to the lungs, facilitating proper gas exchange in the pulmonary circulation.