At the capillaries oxygen leaves red blood cells to supply the tissues and carbon dioxide enters the circulation to be removed.
Blood that leaves the capillary and arrives the small venules. These venules gradually become larger vessels called as veins. The vena cava are the two largest veins that carry blood into the right upper chamber of the heart .
A junction of tiny blood vessels are termed as capillaries that forms very small arterial branches to very small veins. The capillaries have very thin walls, and through them, nutrients and oxygen are delivered to the cells. Generally the Waste products are brought into the capillaries. After the capillaries release oxygen and other substances from blood into body tissues.
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