GIT1 - GIT "I have finally come to the konklusion that...

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GIT "I have finally come to the konklusion that a good reliable set ov bowels iz worth more to a man than enny quantity of brains." Josh Billings
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Digestive process Ingestion
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Digestive process Movement of food PERISTALSIS SEGMENTAL CONTRACTIONS
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Patterns of Contraction After meals : Between meals : GI tract is largely empty Series of slow contractions passing from: stomach small intestine large intestine colon 90 minutes Called: “ migrating motor complex sweeps food remnants, bacteria out of upper GI tract into large intestine Peristaltic contractions: bolus t 0 contraction receiving segment bolus t 1 contraction Progressive waves of contraction moving from one section of the GI tract to another circular muscle behind the bolus of food contract pushing it into the receiving segment, that has relaxed circular muscles ~2-25 cm/sec hormones, paracrine factors, autonomic nervous system input all influence peristalsis
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Overview of GI Processes Food Secretion Digestion Absorption Blood Vessels Motility
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Laparotomy
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Intestinal gangrene
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Anatomy of the Digestive System 15 feet 13 feet Oral Cavity Esophagus Stomach Small Intestine Large Intestine Colon Rectum food feces chewing secretion of saliva by: pathway for food through thorax to the abdomen consists of skeletal muscle at top that turns to smooth muscle 2/3rds the way down consist of 3 segments: fundus body antrum continues digestion by mixing food with acid & enzymes to create chyme opening between stomach & small intestine is the pyloric valve, which regulates rate of chyme entry consists of three segments: duodenum , jejunum and ileum most digestion & absorption takes place in small intestine by intestinal enzymes and secretions from pancreas & liver 1.5 L of chyme passes into large intestine/day proximal section of large intestine where watery chyme is converted into feces terminal section of large intestine distension of rectum initiates defecation reflex , which is under voluntary control
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Barrett’s esophagus
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Achalasia Cardia
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Hisrschsprung disease
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Digestive process Digestion
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Digestive process Absorption
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lumen of digestive tract interstitial fluid wall blood food digestion motility absorption secretion Absorption is not regulated. “What you eat is what you get!” Motility is tightly regulated to ensure there is enough time for food to be digested and absorbed properly Secretion is regulated to ensure digestive enzymes are secreted in sufficient amounts to break down food after absorption, cellular metabolism directs their use or storage
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Carbohydrates & their fate
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Monosaccharides Disaccharides
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Polysaccharides
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digestion mechanical breakdown chewing, smooth muscle contractions surface area break down macromolecules for absorption enzymatic breakdown to facilitate Carbohydrate digestion
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This note was uploaded on 10/10/2011 for the course ZOO 3733 taught by Professor Sa during the Spring '07 term at University of Central Florida.

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GIT1 - GIT "I have finally come to the konklusion that...

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