A tube which has an internal diameter of hair-like thinness
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Capillary (blood capillary) The narrowest type of blood vessel in the vertebrate circulatory system. Capillaries conduct blood from arterioles to all living cells: their walls are only one cell layer thick, so that oxygen and nutrients can pass through them into the surrounding tissues. Capillaries also transport waste material (e.g. urea and carbon dioxide) to venules for ultimate excretion. Capillaries can be constricted or dilated, according to local tissue requirements. See microcirculation
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