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The tricuspid valve is the structure that prevents the backflow of blood from the right ventricle into the right atrium. This valve is located between these two heart chambers and plays a critical role during the cardiac cycle. When the right ventricle contracts to pump deoxygenated blood into the pulmonary artery for oxygenation in the lungs, the tricuspid valve closes tightly to ensure that blood does not flow backward into the right atrium.

The function of the tricuspid valve thus is essential for maintaining unidirectional blood flow and efficient cardiac function. Its closure also contributes to the overall pressure management within the heart, ensuring that each chamber operates effectively to move blood through the circulatory system.

Other valves, while important, serve different roles. The mitral valve controls blood flow between the left atrium and left ventricle, the aortic valve manages blood flow from the left ventricle into the aorta, and the pulmonary valve regulates blood flow from the right ventricle into the pulmonary artery. Each valve has a distinct function, but in this context, the tricuspid valve's role in preventing backflow specifically addresses the question asked.