Heart - The organ that pumps blood throughout the body. - The organ that pumps blood throughout the body., Arteries - - Blood vessels that carry blood away from the heart., Veins - - Blood vessels that carry blood back to the heart, Capillaries- - The smallest blood vessels where exchange of oxygen and nutrients happen, Aorta - - The largest artery in the body., Blood - - The fluid that carries oxygen, nutrients, and waste products.,

Circulatory System. Matching type

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