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The atrium and the ventricle work as a pair. The heart has two of these pairs making the four chambers. The right pair receives blood returning from the body and pump it to the lungs. The left pair receive blood from the lungs and pump it to the body. The atriums are on top and the ventricles are on the bottom of the heart. The atrium receives the blood and pumps it to the ventricle which, in turn, pumps it to the the lungs or body. The atrium creates a supercharge or extra push, increasing the efficiency of the ventricle by about 20%.

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11y ago

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