1530s, a running (usually at full speed), a course (especially of the sun, etc., across the sky), from Middle French carriere road, racecourse (16c.), from Old ProvenÃ§al or Italian carriera, from Vulgar Latin *(via) cararia carriage (road), track for wheeled vehicles, from Latin carrus chariot (see car).
Noun. 1. tricuspid valve-valve with three cusps; situated between the right atrium and the right ventricle; allows blood to pass from atrium to ventricle and closes to prevent backflow when the ventricle contracts. right atrioventricular valve.
This chamber expands to hold the blood. When there is enough blood, the tricuspid (try-CUSS-pid) heart valve allows the blood to flow into the right ventricle (the bottom part of the right side of the heart). The right ventricle pumps the blood to the lungs. The blood needs to return to the lungs to pick up oxygen.