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Capillaries are the smallest of the body's blood vessels, which normally connect the arteries to the veins[1] by way of arterioles and venules. Capillaries enable the interchange of water, oxygen, carbon dioxide, and many other nutrient and waste chemical substances between blood and surrounding tissues.[2]

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  1. unk. (n.d.). Glossary of Terms. The Brain Aneurysm Center. Retrieved on 2008-09-29.
  2. var. (n.d.). Capillary. Wikipedia. Retrieved on 2008-09-29.