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Introduction to Physiology: The Human Body
www.terpconnect.umd.edu• Gastrointestinal System • Nutrients, including carbohydrates, fatty acids, and amino acids, are absorbed from ingested food, through the walls of the gastrointestinal tract, and into the extracellular fluid of circulating blood • Hepatic System • The liver acts to chemically modify ingested, but difficult to absorb, nutrients