Mitral valve

Normal Mitral Valve

The mitral valve controls blood flow between the upper and lower chambers of the left side of the heart. The upper chamber is called the left atrium. The lower chamber is called the left ventricle.

The mitral valve allows blood to flow from the left atrium into the left ventricle, but not back the other way. The heart also has a right atrium and ventricle, separated by the tricuspid valve.

With each heartbeat, the atria contract and push blood into the ventricles. The flaps of the mitral and tricuspid valves open to let blood through. Then, the ventricles contract to pump the blood out of the heart.

When the ventricles contract, the flaps of the mitral and tricuspid valves close. They form a tight seal that prevents blood from flowing back into the atria.

Source: NHLBI (NIH)1

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Mitral Valve: The valve between the left atrium and left ventricle of the heart.2

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References

  1. Source: NHLBI (NIH): nhlbi.nih.gov/ health/ health-topics/ topics/ mvp
  2. Source: MeSH (U.S. National Library of Medicine)

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