Question

what is double circulation of blood

Answer 1

The double circulatory system of blood flow basically refers to the separate systems of pulmonary circulation and systematic circulation in birds, mammals (including humans) and amphibians. But fishes have a single circulatory system because they do not have lungs. In general, all animals with lungs have a double circulatory system.
In the double circulatory system of blood in humans, the heart consists of two separate pumps: the right side with the right atrium and ventricle (which pumps deoxygenated blood into the pulmonary circulation) and the left side with the left atrium and ventricle ( which pumps oxygenated blood into the systematic circulation).

Answer 2

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$\blue\longmapsto\:$ The blood circulation in which blood passes through the heart twice ,in a complete cycle is called double circulation.It consists of pulmonary circulation and systematic circulation.

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