NUTR 3210 Lecture Notes - Lecture 3: Gastric Acid, Gastric Glands, Cecum
6 Oct 2015
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Digestive systems: different species, different needs, different systems : simple system (w/o caecum) p y, simple system (with functional caecum, ruminant systemy, avian system. E: mouth, esophagus h, stomach, small intestine. Gi tract = digestive tract digestive system. Digestive system = gi tract + associated organs (liver, pancreas, gallbladder) 11/09/2014: simple system e. g. human, pig, cat, dog. Suited for a nutrient dense, low fibre diet. Two enzymes released: -amylase and lingual lipase: stomach (cardia, fundus, body, antrum, empty = 50ml, filled = 1-1. 5l, gastric glands secrete gastric juice. H2o, electrolytes, hcl, enzymes: ph of stomach is acidic ~ 2, food become chyme, gastric emptying = 2-6 hrs. Digestion of food pancreatic juice, bile acids: large intestine (also called the colon) g. Production of short chain fatty acids (scfa) Small intestinal surface area: kerckring folds, villi (and crypts, microvilli. Large intestine: ~1013 total human cells (~70 kg, ~1014 total bacteria (~1 kg) Ferment undigested fibre, resistant starch, protein, etc.
