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Double Circulation
The human heart is four-chambered with upper chambers called atria and lower
chambers called ventricles. The right atrium and ventricle receive the deoxygenated
blood from the body organs and pump it to the lungs. The left atria and ventricles
receive the oxygenated blood from the lungs and pump it to the body organs. Hence,
the blood flows through the heart two times and completes the two circulations
called double circulation ..
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