How do the blood cells exit the closed tube that is your vein, and enter the organs through a physical passage?
In: 5
Arteries take the blood from the heart. They branch out until they go everywhere in your body.
Very small veins lead to capillaries, which are really tiny blood vessels with walls so thin that things can pass through them. These deliver the blood to every living cell, and the thin walls allow things like nutrients to enter the cell or leave the cell to go to other cells or for the cells to get rid of their waste.
The other end of the capillary connects to veins, which essentially reverse the process, connecting together over and over until they reach the heart.
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