How do the blood cells exit the closed tube that is your vein, and enter the organs through a physical passage?
In: 5
Well they don’t leave veins into the organs..it’s the other way around. Veins are the return path. Arteries are the path from the heart. Either way, every part of our body is crisscrossed with tiny tiny blood vessels called capillaries. Some of the small spaces are no bigger than one red blood cell around. The small size and large number means an increased surface area for the blood to transfer it’s oxygen and nutrients as well as pick up wastes. Capillaries are the transition point, they’ll eventually connect and form a vein flowing back to the heart.
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