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Capillaries are considered separately from veins. They are the smallest vessels in the circulatory system. Exchange of oxygen and carbon dioxide occur through them. Also wastes and nutrients.
Veins carry deoxygenated blood from systemic circulation back to your heart. Capillaries are the small blood vessels that transfer blood between arteries and veins. The capillaries supply the cells with nutrients, fluids and oxygen. Capillaries also remove carbon dioxide.

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Q: What is the function of the veins and capillaries?
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Which veins open up into the capillaries?

plmonary veins begin as capillaries and end as capillaries


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What are the main kind of blood vessels and what function do they perform?

The main kind of blood vessels are Veins,Arteries, and Capillaries. Arteries carry oxygenated blood to other organs. Veins carry blood with carbon dioxide back to the heart. Capillaries connect Veins and Arteries and let oxygen out to the organs and carbon dioxide in to the veins.


What are the main kinds of blood vessel and what function do they perform?

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