Digestive System II - Digestion:Day2 AnotherLookattheBolus...

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Digestion : Day 2
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Visceral smooth muscle shows rhythmic cycles of activity Pacemaker cells ( these set up your BASIC ELECTRICAL RHYTHM (BER) . These cells are called the “interstitial cells of cajal”. Set up a constant rate of peristaltic wave of 3 per minute. Peristalsis Waves that move a bolus Segmentation Churn and fragment a bolus Another Look at the Bolus
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Pharynx 3 Parts: Nasopharynx: behind the nasal cavity Oropharynx: extends from the soft palate to the epiglottis. Laryngopharynax: extends from the epiglottis to the base of the larynx, which is continous w/ the esophagus. Function : Initiate peristalsis
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Esophagus Extends from pharynx through the diaphragm to the stomach. Continues peristalsis A thickening of the smooth muscle , the esophageal sphincter, at the esophageal- stomach junction, controls the food passage into the stomach.
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STOMACH Left side of abdominal cavity Different Regions:1 . Cardiac (Opening), 2.Fundus (Expanded portion,lateral to cardiac), 3.Body( Midpart) and 4.Pylorus (Terminal part of the stomach which is continuous w/ the sm. Intest.) Function(s): 1. Temporary Storage Area 2. Site for chemical digestion of Protein. ALSO, the Glands are going to be different for the various sections……. .
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Figure 24.12  The Stomach Figure 24.12b
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When and Where is a gland  “Pyloric” ? When is it Gastric?
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Cells of Gastric Glands Mucous cells secrete mucus Regenerative cells divide rapidly to produce new cells that migrate to surface Parietal cells secrete HCl acid and intrinsic factor Chief cells secrete pepsinogen chymosin and lipase in infancy Enteroendocrine cells secrete hormones and paracrine messengers D and G cells
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Positive Feedback Control- Gastric Secretion
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What is a  ZYMOGEN? PEPSINOGEN is one. It is an inactive enzyme, usually a long molecule that, when shortened, becomes activated. Pepsinogen is activated by hydrochloric acid as it cleaves Pepsinogen to PEPSIN.
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DIGESTION OF NUTRIENTS Carbohydrates: Oral Cavity Small Intestines Proteins: Stomach and Small Intestines Fats: Small Intestines
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Carbohydrates Mouth: Amylase( present in saliva) digests starch to oligosaccharides. Has pH optima of 6.75 -7.0 Sm. Intestines : Pancreatic amylase; oligosaccharides
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This note was uploaded on 12/08/2011 for the course AMY 2B taught by Professor Dianeolin during the Summer '09 term at Riverside Community College.

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Digestive System II - Digestion:Day2 AnotherLookattheBolus...

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