HUN 2201 Lecture Notes - Pancreatic Juice, Intestinal Gland, Gastric Pits

• School: University of Florida
• Department: Food Science and Human Nutrition
• Course: HUN 2201
• Professor: All

Document Summary

Hun 2201 ch 3 digestion, absorption, metabolism. Food becomes us: atoms form molecules, organic molecules contain carbon bonded to hydrogen, cells for tissues and organs, which cooperate as organ systems. The digestive system: organs of the digestive system. Mouth, pharynx, esophagus, stomach, small intestine, large intestine, anus. Food within the lumen is technically not yet absorbed inside the body. Transit time: food in gi tract 24-72 hours: affected by composition of the diet, physical activity, emotions, medications, illnesses. The wall of the gi tract contains 4 layers of tissue: mucosa lines the lumen, protects and absorbs end products of digestion. Cells have short life span and are in direct contact with digestive secretions. When these cells die, they are sloughed off into the lumen or eliminated in feces. Reproduce rapidly and have high nutrient requirements; one of the first parts of the body affected by nutrient deficiencies: surrounding mucosa is layer of connective tissue containing nerves and blood vessels.