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The point of a blood vessel is to transport blood throughout the body in order to distribute nutrients and wick away cellular waste. The only living cells in the body that aren't directly served by blood vessels are the cells in the eye's cornea; rather than obtain their nutrients through blood, these cells receive all needed nutrients through diffusion across the aqueous humour (the watery substance between the lens and the cornea). Other body parts that don't have blood vessels include hair, nails, enamel, and outer skin layers.

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