RT Book, Section A1 Ciccone, Charles D. A1 Bednarek, Melissa L. A1 Miller, Kenneth L. SR Print(0) ID 1188530013 T1 Gastrointestinal Drugs T2 Pharmacology in Rehabilitation, 5e YR 2022 FD 2022 PB F. A. Davis Company PP New York, NY SN 9781719645348 LK fadavisat.mhmedical.com/content.aspx?aid=1188530013 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.