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almost all parts of the body are vascular . Minute and very close-set canalis, which have opened into one another traverse them and constitute a small-meshed network . The canalis or rather tubes have distinct but very delicate walls . the walls contain a memdrane that includes a number of thin epithelial cells, which are bound together at their edges . There is a small oval nucleus in each of these cells . These tubes are the blood capillaries . They vary in diameter from 7 to 12 um. But there are certain parts of the body in which these blood capillaries have been adsent . These are the epidermis and epithelium, the nails and hairs, the substance of the teeth and the transparent cornea of the eye .
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