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 http://www.youtube.com/watch?v=SyVcyT-fOao. Learning Goals. I understand the function and stages of the digestive system

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The Digestive System

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The digestive system

The Digestive System


A brief introduction

A Brief Introduction...

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

http://www.youtube.com/watch?v=SyVcyT-fOao


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.


Definitions

Definitions

  • 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.


Disease of the digestive system

Disease of the Digestive System


Summary

Summary

  • 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.


Homework

Homework

  • 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

  • QUIZ ON MONDAY


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