They allow diffusion of various substances and establish continuity between arteries and veins what are 'they' here?
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Answer:
CAPILLARIES
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Veins are less flexible than arteries. ... The chief difference between arteries and veins is the job that they do. Arteries carry oxygenated blood away from the heart to the body, and veins carry oxygen-poor blood back from the body to the heart. Your body also contains other, smaller blood vessels.
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