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The mitral valve is one of the four valves in the human heart, located between the left atrium and the left ventricle. It plays a crucial role in ensuring the unidirectional flow of blood from the left atrium into the left ventricle and preventing backflow during ventricular contraction. When the left atrium fills with oxygen-rich blood from the lungs, ___ __________ _____ __________ __________ __________ __________.
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