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What does the term Double circulation means?

April 26, 2017circulation double Education learning means Subjects term

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What does the term Double circulation means?

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“The double circulatory system of blood flow refers to the separate systems of pulmonary circulation and the systemic circulation in amphibians, birds and mammals (including humans.) In contrast, fish have a single circulation system because they do not have lungs. All animals with lungs have a double circulatory system. For instance the adult human heart consists of two separated 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 systemic circulation).