(view: anterio-rostral from the apex [up and out the front])
An examined heart with a replaced tricuspid valve. This artificial replacement valve has a small sphere resembling a ping pong ball bound by four wires. When the ventricles contract, the ball is shifted cranially within the cage to seal the right atrio-ventricular junction This particular replacement is known as the caged ball design.
(view: anterio-rostral from the apex)
This is a video of us examining another heart sporting a different artificial valve known as the tilting disc. This heart has been cut open, upon autopsy, to reveal the inner muscles and chordae tendinae regulating blood flow. This valve works much like the normal water valves you see in water lines (as told by Tricia); finally our engineering and medical worlds collide!!
Both of these valves can be seen better at voila!

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