What Connects Arteries To Veins?

Arteries and veins are connected by capillaries. 

At the capillaries, which connects the arteriole and venal blood flow, exchange of nutrients, gases and wastes takes place through the process of diffusion. The walls of the capillaries are one cell thick. Blood cells usually line up through the capillaries supplying the most efficient medium for exchange with the adjacent tissues.

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