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In humans and mammals, the heart.

We breathe in oxygen, which is released by trees and plants. Lungs fill with oxygen and is picked up by the blood in the capillaries of the alveoli. The blood travels to the heart via the pulmonary vein where it is pumped to every part of the body.

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14y ago
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7y ago

Heart, arteries, veins, and capallaries.
Heart,arteries and veins...

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15y ago

The heart is the only organ in the circulation system. The circulation system also consists of blood vessels (veins, arteries and capillaries).

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11y ago

-Heart

-Lungs

-Muscles

-valves

bea

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Q: What are the major organ for circulation?
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