Question

mitral valve prolapse causes blood to leak back into the ______ when the ventricles contract.

Explanation:

The mitral valve is located between the left atrium and the left ventricle. During ventricular contraction (systole), the mitral valve should close to prevent blood from flowing back into the left atrium. In mitral valve prolapse, the valve doesn't close properly, so blood leaks back into the left atrium.

Answer:

left atrium