What is the function of the pulmonary valve?

What is the function of the pulmonary valve?

• A. To prevent backflow of blood from the pulmonary artery to the right ventricle.
• B. To prevent backflow from the aorta to the left ventricle.
• C. To regulate blood flow from the left atrium to the left ventricle.
• D. To allow blood flow from the right atrium to the right ventricle.

Answer: (A)

The main idea is how heart valves ensure one-way blood flow. The pulmonary valve sits between the right ventricle and the pulmonary artery. It opens when the right ventricle contracts to push blood into the lungs and closes afterward to prevent blood from flowing back into the ventricle as the ventricle relaxes. This shutdown of backflow is essential for maintaining forward flow through the pulmonary circuit. In contrast, the aortic valve handles backflow prevention from the aorta to the left ventricle, the mitral valve regulates flow from the left atrium to the left ventricle, and the tricuspid valve regulates flow from the right atrium to the right ventricle.

The main idea is how heart valves ensure one-way blood flow. The pulmonary valve sits between the right ventricle and the pulmonary artery. It opens when the right ventricle contracts to push blood into the lungs and closes afterward to prevent blood from flowing back into the ventricle as the ventricle relaxes. This shutdown of backflow is essential for maintaining forward flow through the pulmonary circuit.

In contrast, the aortic valve handles backflow prevention from the aorta to the left ventricle, the mitral valve regulates flow from the left atrium to the left ventricle, and the tricuspid valve regulates flow from the right atrium to the right ventricle.