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 cells veins compounds erythrocytes toxic health leukocytes non-stick substances teflon isolated rendering closeup macro