From the above. The exchange of substances between blood and fluid in cells occurs that the epithelial lining of the artery. Some substances and compounds shall be carried to the small molecules such as exocytosis by O2 and CO2, it is distributed to the various tissue cells, or text through the pores, the smaller of the walls of the blood vessels. It also can transport nutrients such as sugars, salts and urea, to flow to the tissues by the blood pressure.
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