Y are valves present in the heart?
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to stop the back flow and mixing of impure and pure blood together...
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The mitral valve and tricuspid valve, which control blood flow from the atria to the ventricles
.The aortic valve and pulmonary valve, which control blood flow out of the ventricles.
.The aortic valve and pulmonary valve, which control blood flow out of the ventricles.
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