Mitral valve is a structure in the heart which is between the upper chamber on the left side of the heart (left atrium) and the lower chamber on the left (left ventricle). The mitral valve opens when the lower chamber is resting, allowing blood to flow in, and then closes as the left ventricle contracts, preventing blood from going backwards. Mitral valve prolapse is a common condition, occurring in up to 20% of the population. Is more common in females, in those who are tall with long arms and legs, and tends to run in families. In most cases, it is quite benign. I like to compare it to being double-jointed, a case in which the joint itself is perfectly normal, but the supporting structures are lax, and allow the person to obtain unusual, but not dangerous, positions.
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