scattered perfluorooctanoic acid (pfoa) molecules, along with red and white blood cells

red blood artery atom scattered pfas cut inside contamination science pollution three dimensional cardiovascular system vessel flow biological cell white close-up poisonous polytetrafluoroethylene vein healthcare medicine chemical molecular structure chemistry color medical condition formula macrophotography pfoa human perfluorinated pfos fluorochemicals circulation bioaccumulative levels scotchgard sulfonate fluorinated exposure hazards concerns perfluorooctanoic acid forever perfluorooctane pollutants acid pfoa red blood cells vessel cardiovascular veins chemical artery compounds atom erythrocytes scattered toxic health human leukocytes pfas perfluorooctane non-stick perfluorinated pfos substances fluorochemicals medical flow circulation teflon contamination bioaccumulative 3d pollutants isolated science levels scotchgard sulfonate fluorinated exposure hazards rendering concerns closeup macro white