Chapter 25 Digestive System

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1

The Digestive System is the system that?

1. Processes Food

2. Extracts Nutrients

3. Eliminates the residue

2

What are the 6 basic processes digestion?

1. Ingestion 4. Digestion: Mechanical and Chemical

2. Secretion 5. Absorption

3. Mixing and Propulsion 6. Defecation

3

Explain what ingestion is?

Is the taking in of food and liquids into the mouth (eating).

4

Explain what secretion is?

About how much do you secrete per day?

Is the release, by cells within the walls of the GI tract and accessory organs, of water, acid, buffers, and enzymes into the lumen of the tract.

About 7L/day

5

Explain what mixing and propulsion is?

Results from the alternating contraction and relaxation of the smooth muscles within the walls of the GI tract in order to mix food and secretions and propel them toward the anus.