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Digesti ve System

Student Learning Objec tives:1. Describe the structure and function of the organs of the digestive system.2. Distinguish between mechanical and chemical digestion.3. Describe the membranes of the digestive system (e.g. greater omentum).4. Describe the structural and functional features of the layers of the GI tract.5. Describe the changes that occur in the structure of the GI tract along its path, including structures thatincrease surface area, and relate these changes to the functions of the organs.6. Explain neural and hormonal regulation of digestion.7. Describe the source, amounts, composition, pH and function of the digestive juices.8. Explain the function of the assigned digestive enzymes.9. Describe the sites and mechanisms for absorption and transport of nutrients.10.Describe the types of motility that occur in each region of the GI tract.11.Describe the function and regulation of the sphincters of the GI tract.12.Describe the composition of feces and explain the defecation reflex.

Reading Assignment :

Saladin A&P 5th

edition: Chapter 25

Practice Problems:

Chapter 25: Think About It: pp. 979, 990, 992, 999, 1001Before You Go On: #1, 2, 4, 9-18, 20-23, 25, 27, 28Testing Your Recall: #1, 3-6, 8-10, 12, 14-16, 19True or False: #1, 4-10

Testing Your Comprehension: #1, 2, 5

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Lec tu re Outline/Images:Digesti ve System Basic Processes

Motility:

Secretion:

Function: Digestion:

Absorption:

Chemical Digestion

Macromolecules Absorbable UnitsCarbohydrates

Proteins

Fats

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Mesenteries

Histology of GI Tract

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Regulation of GI Tract

Tour of the Gut:Mouth

Mastication Salivary glands and saliva

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Gastric secretions: HCl

Functions:

Pepsin and Intrinsic Factor

Gastric Motility:Receptive relaxation

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Peristaltic waves

Digestion and Absorption

Regulation of Gastr ic Function

Cephalic phase Gastric phase

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Regulation of Gastr ic Function (cont'd):Intestinal phase

"Enterogastric reflex"

Accessory Organs to Small I ntestine: Liver & Gallbladder

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Liver Secretions

Accessory Organs: Pancreas

Activation of ProteolyticEnzymes

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Regulation of Secretion

Small Intestine

Duodenum

Jejunum

Ileum

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Intestinal Secretions

Absorption

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Digestion and Absorption:Carbohydrates

Proteins

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Fats (cont'd)

Vitamins, Minerals, Water

Water-soluble vitamins:

Fat-soluble vitamins:

Minerals:

Water:

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Motility of Small IntestineSegmentation Peristalsis: Migrating Motor Complex

Large Intesti ne

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Secretions:

Digestion:

Absorption:

Motility:

Defecation reflex