RT Book, Section A1 Ciccone, Charles D. SR Print(0) ID 1135036823 T1 Gastrointestinal Drugs T2 Pharmacology in Rehabilitation YR 2016 FD 2016 PB F. A. Davis Company PP New York, NY SN 9780803640290 LK fadavisat.mhmedical.com/content.aspx?aid=1135036823 RD 2024/03/29 AB The gastrointestinal (GI) tract is responsible for food digestion and the absorption of nutrients and water. Dietary constituents undergo a series of digestive processes as they progress through the GI system. Under normal conditions, the transit time of food and water is adequate to allow the processes of digestion and absorption to take place. Indigestible and nonabsorbable products are eliminated by defecation.