In the diagram,which labeled structure prevents blood flow from the right ventricle back into the right atrium?

Name: In the diagram,which labeled structure prevents blood flow from the right ventricle back into the right atrium?
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The labeled structure B is the tricuspid valve which prevents blood from flowing back into the right atrium from the right ventricle during the contraction of the heart. The other labeled structures (A, C, D, and E) do not serve this function.

In the Diagram,which Labeled Structure Prevents Blood Flow from the Right