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Circulatory systems are essential for nutrient acquisition, gas exchange, and waste disposal in animals, particularly those with complex body structures. There are two main types of circulatory systems: open, where fluid flows freely among tissues, and closed, where blood is confined to vessels. Vertebrate cardiovascular systems have evolved to support higher metabolic rates, with adaptations such as double circulation in land vertebrates and a four-chambered heart in birds and mammals.

Author

aljhnysarh12

Language

EN