To which heart chamber does the blood go after leaving the left atrium? What is the valve that separates these compartments?

To which heart chamber does the blood go after leaving the left atrium? What is the valve that separates these compartments?
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The arterial blood that has come from the lungs to the left atrium passes then to the left ventricle. The valve between the left ventricle and the left atrium is the mitral valve, a bicuspid (two leaflets) valve. The mitral valve is important because it prevents the regurgitation of blood to the left atrium during systole (contraction of the ventricles). The Circulatory System - Image Diversity: mitral valve
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Which is the first (human) heart chamber into which blood enters? Where does the blood go after passing that chamber? What is the name of the valve that separates the compartments? Why is that valve necessary?

Description : Which is the first (human) heart chamber into which blood enters? Where does the blood go after passing that chamber? What is the name of the valve that separates the compartments? Why is that valve necessary?

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