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Carry only deoxygenated blood
Instead of a venule, drain into an arteriole. are devoid of endothelium. spit out mucus after absorbing nutrients from the glomerular capsule.
A single red blood cell can just about squeeze through a capillary, which is a very tiny blood artery. They facilitate the exchange of some substances between your blood and tissues as well as connecting your arteries and veins.
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