The Four Valves · Heart
The door between the right atrium and right ventricle.
On the right side of your heart, blood drops from the upper chamber into the lower one. The doorway between them is the tricuspid valve — three flaps, hence 'tri'.
There's more: the door between the right atrium and right ventricle. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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