by 
Robbie
ANSWERS: 3
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Intelligent design by the Higher Power Creator who built us all from the grand DNA strands. Its little things like this that make one wonder about evolution and the making of the human. Probably some muscles so designed to work the way they work.
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If you mean the mitral and tricuspid valves, they are restrained by papillary muscles attached to the valve leaflets by connective tissue called cordae tendinae. In patients who have suffered heart attacks that damage the papillary muscles, the valves can become regurgitant (leaky).
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http://www.cardiovasculardocs.com/heart1.htm This shows the anatomy of the heart. The valves can swing the wrong way. Depending on how severe and what valve it is determines the severity. The mitral valve is the most common to "go the wrong way". It is called mitral valve prolapse. It causes blood to regurgitate back where it came from. Usually not serious, but it can be, because not a signifigant amount of blood does this.
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