Double circulation refers to the circulation of blood through the heart twice during each cycle. Other vertebrates, such as birds and mammals, exhibit double circulation, with blood passing through the heart once to the lungs or gills for oxygenation and again to the body tissues.
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Double circulation is a circulatory system where blood circulates through the heart twice during one complete circuit of the body. This ensures a more efficient separation of oxygenated and deoxygenated blood. Mammals and birds exhibit double circulation. In mammals, the right side of the heart pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the body. Birds have a similar pattern, but with additional adaptations to meet the high metabolic demands of flight. Double circulation enhances oxygen delivery to tissues and organs, supporting the increased energy requirements of warm-blooded vertebrates with complex respiratory systems.