Organ, The part of the body that has a specific job, like the heart or lungs., Organ system, A group of organs that work together to perform a specific function., Organism, The entire living being, such as a human, animal, or plant., Circulatory system, The system responsible for pumping blood around the body., Respiratory system, The system responsible for breathing and gas exchange., Arteries, Blood vessels that carry blood away from the heart., Veins, Blood vessels that carry blood back to the heart., Capillaries, Tiny blood vessels where the exchange of gases and nutrients occurs.

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