During diastole, which valve opens to permit blood flow from the left atrium into the left ventricle?

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During diastole, the heart relaxes and the ventricles fill with blood. The valve between the left atrium and left ventricle is the mitral valve, and it opens when the left atrial pressure is higher than the left ventricular pressure, allowing blood to flow into the ventricle. The semilunar valves (aortic and pulmonary) stay closed during diastole to keep blood from flowing backward into the ventricles, and the tricuspid valve is on the right side of the heart, not involved in this left-sided flow. So, the valve that opens to permit blood flow from the left atrium into the left ventricle during diastole is the mitral valve.