Answer:
The heart has four chambers: The right atrium receives blood from the veins and pumps it to the right ventricle. The right ventricle receives blood from the right atrium and pumps it to the lungs, where it is loaded with oxygen. The left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.
Explanation:
Well the whole process depends on these factors or at least some of them. WIthout them the whole system would collapse. Like in machines they all have systems that rely on each other. Now if one part broke down the whole thing is possible to collapse if the part isnt fixed or replaced.
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