Which chamber does the pulmonary valve separate from the pulmonary trunk?

Which chamber does the pulmonary valve separate from the pulmonary trunk?

• A. Right ventricle
• B. Left atrium
• C. Right atrium
• D. Left ventricle

Answer: (A)

The main idea here is how semilunar valves mark the boundary between a ventricle and its great vessel. The pulmonary valve sits at the connection between the right ventricle and the pulmonary trunk, opening to push blood into the lungs and closing to prevent backflow into the ventricle during relaxation. So the chamber separated from the pulmonary trunk by this valve is the right ventricle. The left ventricle is separated from the aorta by the aortic valve, and the atria connect to their ventricles via the atrioventricular valves (tricuspid on the right, mitral on the left), not the pulmonary valve.

The main idea here is how semilunar valves mark the boundary between a ventricle and its great vessel. The pulmonary valve sits at the connection between the right ventricle and the pulmonary trunk, opening to push blood into the lungs and closing to prevent backflow into the ventricle during relaxation. So the chamber separated from the pulmonary trunk by this valve is the right ventricle. The left ventricle is separated from the aorta by the aortic valve, and the atria connect to their ventricles via the atrioventricular valves (tricuspid on the right, mitral on the left), not the pulmonary valve.