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Gastrointestinal absorption is the process by which drugs pass from the gastrointestinal tract into the systemic circulation. The absorption of drugs occurs mainly through the stomach and small intestine. Various mechanisms are involved in this process depending upon the physicochemical properties of the drug and physiological conditions of the gastrointestinal tract. Passive diffusion is the most common mechanism of drug absorption. In this process, drugs move from an area ___ ___ ___ _______ _____ _________ ____ _________ ____ ______ __________.
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