Which valve prevents backflow from the pulmonary artery into the right ventricle?

The valve that prevents backflow from the pulmonary artery into the right ventricle is the pulmonic valve. This valve is located between the right ventricle and the pulmonary artery, ensuring that deoxygenated blood flows efficiently out of the heart and into the pulmonary circulation for oxygenation in the lungs. When the right ventricle contracts during systole, the pulmonic valve opens to allow blood to exit into the pulmonary artery. As the ventricle relaxes, the valve closes to prevent any backflow of blood into the ventricle, maintaining proper directionality of blood flow in the circulatory system. This function is crucial for efficient cardiac operation and effective pulmonary circulation.