what is the role of saliva and tears in excretion
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A minor role is played by sweat, tears, breast milk and saliva6. Saliva is not truly an excretory route however as it is usually swallowed, thus allowing some drugs to be reabsorbed from the gastrointestinal tract. The pH of saliva varies from 5.8 to 8.4. Unionized fat soluble drugs are excreted passively from saliva.
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