what happens to the blood when left atrium relaxes
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Blood circulation begins when the heart relaxes between heart beats. Blood then flows from both upper atrium's (left atrium and right atrium) into the two lower chambers (left and right ventricles) which then expand.
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Blood leaves the lungs and returns to the heart entering the left atrium through two veins called the pulmonary veins. The atrium is relaxed (diastole) as blood enters. As the atrium fills, the pressure inside rises. The mitral valve (between the atrium and ventricle) is closed to stop blood entering the ventricle.
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