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The Digestive System

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The Digestive System. A Brief Introduction. YouTube Clip: I can't believe it remix ( The Digestion Song) Travis Finlay Learning Goals. I understand the function and stages of the digestive system

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a brief introduction
A Brief Introduction...

YouTube Clip: I can't believe it remix ( The Digestion Song) Travis Finlay

learning goals
Learning Goals
  • I understand the function and stages of the digestive system
  • I know the structure and function of the organs involved in the digestive system.
  • I know the diseases associated with the digestive system.
what does the digestive system do
What does the Digestive System do?
  • Takes in food
  • Breaks food down into smaller units
  • Absorbs nutrients
  • Excretes waste

Digestion: The process of breaking down food to provide nutrients and energy for growth, repair and reproduction.

the four stages of digestion
The Four Stages of Digestion
  • Ingestion: Intake of nutrients
  • Digestion: Breakdown of nutrients into smaller units by:

a. Physical – Mechanical breakdown of food

b. Chemical – Enzymes and chemicals that breakdown food

3. Absorption – Taking nutrients into cells

4. Egestion – Excretion of waste

the digestive tract
The Digestive Tract
  • One long tube that extends from the mouth all the way down to the anus
  • Goblet cells secrete mucus
  • Madeof epithelial tissue, layers of muscles and nerves
  • Food moves through by a process called peristalsis.

Wave like motion from the alternate contraction/relaxation of smooth muscle in the digestive tract.

  • Mucus – Secreted by goblet cells in the epithelial tissue. Has two functions:

1. Protects the digestive tract from enzymes

2. Allows the digested material to pass through the tract

  • Accessory Organ – Aids in the process of digestion but food does not actually pass through.
  • The digestive system takes in food, breaks it down, absorbs nutrients and excretes waste.
  • The digestive system is made up of the digestive tract and accessory organs.
  • The digestive tract is one long tube with opening at either ends and includes the mouth, esophagus, stomach , large intestine, small intestine, and anus.
  • The digestive tract includes epithelial tissue, smooth muscle tissue, nerves and connective tissues. The smooth muscles can contract and relax involuntarily.
  • The accessory organs aid in the process of digestion and include the liver, pancreas and gall bladder.
  • In class: Questions from textbook page 82 # 2, 3 and 4.
  • Gizmo on the Digestive System.
  • - Complete the 5 page handout (Parts A and D) for homework and answer the 5 quiz questions online.
  •  Due Friday in class