BIOL 102 Lecture Notes - Lecture 24: Sodium Bicarbonate, Chyme, Pepsin
23 Apr 2017
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Document Summary
Two types of motility aid digestive processes: motility enable by smooth muscle in the muscularis layer, peristalsis: propels food forward, segmentation: mixes food. The mouth processes food for swallowing: teeth: bite and chew food, types: incisors, canines, premolars, molars, children: 20 teeth, adults: permanent teeth, structure: crown, root, tongue: positions and tastes food, skeletal muscle, moves food in mouth, taste, saliva. Stomach: storage facility (do not absorb nutrients through the stomach, keep food from a meal for 2-6 hours in the stomach, mix food with gastric juice three layers of muscles in stomach, contains, hcl- hydrochloric acid. Small intestine: 10ft 10in long, all digestion occurs in first 10 inches, all absorption occurs in 10 feet, 3 regions, duodenum- where digestion takes places (first 10 inches) Ileum- where absorption occurs, 10 ft portion: jejenum- where absorption occurs, 10 ft portion, duodenum. Input from pancreas: digestive enzymes: emptied into the front of the small intestine along with sodium bicarbonate, proteases, carbohydrases, lipases.
