Animal_Science_9-16-08 - Three Phases of Gastric Secretion...

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Animal Science 9-16-08 There are 4 steps in digestion: Digestion Absorption Circulation of absorbed nutrients Cellular metabolism What are nutrients? Parts of food which provide for growth, maintenance, body functions Carbohydrates Fats Proteins Vitamins Minerals Water Ruminant? Animals with more than one stomach compartment Chew their food (re-chew food) Why don’t cattle need as much B vitamins? Microorganisms in stomach make own B vitamins Also make some proteins Digestive System Large complex molecules broken down into simpler molecules Long tube beginning with mouth and ending with anus Digestion Swine, Poultry, and Fish are functionally nonruminants
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Pathway Food-Mouth-Esophagus-Stomach-Small intestine----(action spot!)---- Food/ Mouth Food is a bolus and putting in the mouth is prehension Mouth = chewing = larger surface area on food for easier digestion Stomach Small amounts of Pepsin ogin are released and the stomach become acidified through the hormone Gastrin
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Unformatted text preview: Three Phases of Gastric Secretion • Cephalic phase • Gastric phase--All designed to break down nutrients • Intestinal phase Stomach 1. Food Stomach 2. Gastrin (hormone) 3. Gastrin Chief cell to produce HCL, in turn pH goes down 4. pH down to correct level activates pepsinogen(pepsin active) Pepsin ↓ Break down protein into amino acids Small Intestine • Once the food is in the small intestine a number of hormones are released/stimulated: • Hormones Secretin Gastric Inhibitory • Important digestive and absorptive functions Secretions and buffers provided by pancreas, liver, gall bladder • Three Subdivisions: Duodenum Jejunum Lleum Lleocecal sphincter Transition between small and large intestine Large intestine Reabsorb water and compact material into feces Absorb vitamins produced by bacteria Store fecal matter prior to defacation Gall Bladder Horses don’t have gall bladders...
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Animal_Science_9-16-08 - Three Phases of Gastric Secretion...

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