Which valve is located between the right ventricle and the pulmonary artery?

• A. Movement of blood
• B. Semilunar Valve
• C. Cardiac Conduction System
• D. Bicuspid Valve

Answer: (B)

The valve between the right ventricle and the pulmonary artery is the pulmonary valve, a semilunar valve. Its job is to open during right-ventricular contraction (systole) to allow blood to flow into the pulmonary artery and to close when the ventricle relaxes (diastole) to prevent backflow into the ventricle. This keeps blood moving toward the lungs and stops it from flowing backward. The pulmonary valve has three cusps and lies at the mouth of the pulmonary artery. This is distinct from the bicuspid (mitral) valve, which sits between the left atrium and left ventricle, and from the valve between the right atrium and right ventricle. The cardiac conduction system is the heart’s electrical system, not a valve.