Toxins may accumulate in the blood and eventually affect mental functioning. Also, food residues do not usually accumulate extraneous deposits. Residual nutrients from salmon can also accumulate downstream in estuaries. In CKD numerous uremic toxins accumulate in the blood. PFOA does not accumulate in fat tissue, unlike traditional organohalogen persistent organic pollutants. As they rise, these bubbles accumulate hydrophobic substances. Benzaldehyde does not accumulate in human tissues. Impurities accumulate more quickly in the brood comb. Eczema can be characterized by spongiosis which allows inflammatory mediators to accumulate. This is why some serfs were able to do things such as accumulate wealth. Herbicides can accumulate in insects through bioaccumulation. Over time, the ditch would slowly accumulate piles of mud. Whites have historically had more opportunities to accumulate wealth. The beneficiaries of these developments would accumulate immense wealth. These may accumulate up to deep, killing trees by their concentration of chemicals.