Lecture 04B and 07 - 011311

Lecture 04B and 07 - 011311 - Lecture#4B and 7 Professor...

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1 Lecture #4B and 7 Professor Julian Schroeder • We may start on this lecture after completing the Immune System lecture on Thursday, and will then continue on this lecture after lectures 5 and 6 on the syllabus, as this lecture can be long. I. Human Digestive System II. Digestive Hormones III. Nutrients
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2 INTERNAL HOMEOSTASIS Figure 40.4
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3 Mechanical breakdown & mixing Enzymatic breakdown Nutrient absorption Waste defecation Storage Transport of nutrients through degradation process FUNCTIONS HUMAN DIGESTIVE SYSTEM Mouth Teeth: mechanical breakdown Salivary Glands: Saliva contains mucin (glyco-P) lubrication ALIMENTARY CANAL Starch --------------- > Maltose (disaccharide) Amylase Muscular sac at end of esophagus Mechanical breakdown – peristaltic contraction TYPE 1 PARIETAL CELLS Secrete H + 0.1 M H + = 100 mM HCl in stomach pH = 1 Acidic pH: Activates enzymes Food breakdown Defense against invaders Chemical breakdown – 3 secretory cell types in stomach wall Gastric juices STOMACH
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4 TYPE 2 CHIEF CELLS Secrete Pepsinogen Pepsinogen --------------- > Pepsin & polypeptide (inactive) (active at acid pH) Pepsin partial breakdown of proteins TYPE 3 MUCUS CELLS Secrete Mucus Coat stomach lining Protect against self-digestion Low pH
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This note was uploaded on 03/18/2011 for the course BILD 2 taught by Professor Schroeder during the Winter '08 term at UCSD.

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Lecture 04B and 07 - 011311 - Lecture#4B and 7 Professor...

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