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

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Multiple Choice

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

Explanation:
The pulmonary valve is the valve between the right ventricle and the pulmonary artery. It opens to allow blood to be ejected into the pulmonary artery during right ventricular contraction and then closes as the ventricle relaxes, preventing blood from flowing backward into the right ventricle. This one-way flow is what stops backflow into the ventricle after systole. For context, the mitral valve is between the left atrium and left ventricle, the tricuspid valve sits between the right atrium and right ventricle, and the aortic valve is between the left ventricle and the aorta.

The pulmonary valve is the valve between the right ventricle and the pulmonary artery. It opens to allow blood to be ejected into the pulmonary artery during right ventricular contraction and then closes as the ventricle relaxes, preventing blood from flowing backward into the right ventricle. This one-way flow is what stops backflow into the ventricle after systole. For context, the mitral valve is between the left atrium and left ventricle, the tricuspid valve sits between the right atrium and right ventricle, and the aortic valve is between the left ventricle and the aorta.

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