The pulmonary valve is a one-way valve in the heart that allows blood to flow from the right ventricle to the pulmonary artery. It opens when the right ventricle contracts, allowing deoxygenated blood to be pumped to the lungs for oxygenation. After oxygenation, the pulmonary valve closes to prevent blood from flowing back into the right ventricle, ensuring proper blood flow through the circulatory system.

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