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Cardiovascular System:Cardiovascular System Video Index Cardiovascular System Overview Video Heart Chambers, Valves and Blood Flow Video Liver and the Hepatic System Video |
The heart has four valves and four chambers. During a contraction of the heart, the valves open to allow blood to flow in the correct direction. When the heart relaxes, the valves close to prevent blood from flowing in the wrong direction. Interested in learning more about the heart valves, and how they work? Check out the following videos on the heart valves. For additional information, also see our heart valve reference materials. |
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