Heart valves - superior view
There are four valves located in the heart. Each valve either consists of two or three folds of thin tissue. When closed, the valve prevents blood from flowing backwards to its previous location. When open the valve allows blood to flow freely. Valve problems can occur because of congenital abnormalities, infection, or other causes.
Review Date: 05/15/2008
Reviewed By: Robert A Cowles, MD, Assistant Professor of Surgery, Columbia
University College of Physicians and Surgeons, New York, NY. Review
provided by VeriMed Healthcare Network. Also reviewed by David
Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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