Leaflets, flow cont.: Heart valves are made of fibrous tissues that are supported in the case of tricuspid and mitral valves with muscles and apparatus that work as a unit. These generally work as check valves, allowing the flow of blood in one direction only and not backwards.
Answered 12/31/2014
6.4k views
Depends: It depends on the valve. There are 4 of them and they're all different.
Answered 7/19/2013
5k views
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