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circulatory system
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Tweet n. 1. The system of structures in vertebrates consisting of the heart, blood vessels, and lymphatics, by which blood and lymph are circulated throughout the body. 2. A similar system by which a fluid, such as hemolymph, is distributed in other animals.  (click for a larger image) circulatory systemArteries (red) carry blood rich in oxygen from the heart to tissues of the body. Veins (blue) carry blood low in oxygen back to the heart. |
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