Lecture 07 - 012511

Lecture 07 - 012511 - Lecture #4B and 7 Professor Julian...

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1 Lecture #4B and 7 Professor Julian Schroeder • We started on this lecture after completing the Immune System lecture, and will continue on this lecture Tuesday Jan 25th, as this lecture can be long. The following slides are the same that were posted as lecture 4B and 07 after the immune system lecture 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 07 - 012511 - Lecture #4B and 7 Professor Julian...

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