A member asked:

How can the bicuspid and tricuspid valves open and close?

A doctor has provided 1 answer

Pressure gradients: The valve leaflets shown in the picture are very thin- like cloth. When the heart relaxes and pump, pressure gradients open and close the valves. I suggest you watch this video: http://www.youtube.com/watch?v=rguztY8aqpk

Answered 6/27/2014

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