phillybadboy
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capillaries are single and are in direct contact with blood. i know that some veins or arteries have capillaries running through them but some do not right? so for the veins and arteries that don't have veins and arteries running through them, these veins and arteries are composed of multilayered cells, the cells on the innermost layer is in direct contact with blood, but how do nutrients get to cell layers not in direct contact with blood? do nutrient reach other cell layers by going between paracellular by inner cell layers or transcellular through inner cell layers?