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What is meant by double circulation ? Wh...

What is meant by double circulation ? What is its significance?

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The double circulation system of blood flow refers to the separate systems of pulmonary circulation and the systemic circulation. All animals with lungs have a double circulatory system.
In pulmonary circulation deoxygenated blood is pumped away from the heart, via pulmonary artery to the lungs and returns oxygenated blood to the heart via pulmonary vein.
In systemic circulation oxygenated blood away from heart to the rest of the body and returns deoxygenated blood back to the heart.
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