explain single circulation and double circulation
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A type of circulation in which blood flows through the heart twice is called double circulation. This type of circulatory system has separate systemic circulation and pulmonary circulation. ... The systemic veins carry deoxygenated blood from various parts of the body to the right atrium of the heart.
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Single circulation system as found in a typical fish species. The red represents oxygen-rich or oxygenated blood, the blue represents oxygen-deficient or deoxygenated blood. Double circulation pathways are found in birds and mammals. ... Most mammals, including humans, have this type of circulatory system.
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