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... are actually similar in nature to highways and important railways. Oxygen-rich and nutrient-rich blood separates countless small arteries from the arteries.
The small arteries divide into countless capillary arteries, and finally the capillary arteries are interspersed with countless cells and then slowly become capillary veins, converging into small veins, and finally converging into large veins back to the heart.
This is probably a circuit of human blood vessels, and blood is slo ...
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