Absorption barrier

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Term Absorption barrier
Description Any of the exchange sites of the body that permit uptake of various substances at different rates (e.g. skin, lung tissue, and gastrointestinal-tract wall)
Definition Absorption barrier

Any exposure surface that may allow diffusion of an agent into a target. Examples of absorption barriers are the skin, lung tissue, and gastrointestinal tract wall (cf. exposure surface).

References http://www.epa.gov/OCEPAterms/aterms.html
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