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Title:

The Digestive System

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The Digestive System 6th, ... Major Functions of the Digestive System Break down ingested food Put nutrients into the bloodstream Remove waste from the body Organs ... – PowerPoint PPT presentation

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Title: The Digestive System


1
The Digestive System
  • 6th, 7th, 8th Grade Health

2
Digestive System
Warm-up
  • What is the function of the Respiratory System?
  • Name the parts of the Respiratory System?

3
Learning Objectives
  • To recognise the organs involved in digestion
  • To understand the major functions of each body
    part in the digestive process
  • To understand the four major phases of digestion
  • To understand the functions of different enzymes.

4
Major Functions of the Digestive System
  • Break down ingested food
  • Put nutrients into the bloodstream
  • Remove waste from the body

5
Organs of the Digestive System
  • Mouth- teeth, salivary glands, tongue
  • Esophagus
  • Stomach
  • Small Intestine
  • Large Intestine
  • Pancreas
  • Liver
  • Gall bladder

Accessory Organs
6
Mouth
  • Digestion begins here!
  • Teeth and tongue are used in mechanical
    digestion- physical breakdown of food
  • Saliva and enzymes begin chemical digestion-
    chemical breakdown of food

7
Esophagus
  • Muscular tube that connects mouth to stomach
  • Moves food downward by peristalsis, or muscular
    contractions
  • Epiglottis seals off windpipe during swallowing
    to prevent choking

8
Stomach- Mechanical and Chemical Digestion
  • Muscular pouch that expands to hold your food
  • Hydrochloric acid (HCl) and the enzyme pepsin
    combine to form gastric juice

9
Stomach- Mechanical and Chemical Digestion
  • A gummy coating of mucus protects the stomach
    lining from the strong chemicals
  • Chyme, a thick liquid containing partially
    digested food, is produced here

10
Small Intestine
  • Most chemical digestion occurs here!
  • Inner surface is covered in villi and microvilli,
    millions of tiny finger-like projections that
    absorb nutrient molecules from the chyme
  • The villi create a large surface area, so as
  • many nutrients as possible can be absorbed

11
Other Facts of the Small Intestine
  • Longest portion of the digestive tract
  • Tube that is 20- 25 feet long
  • Food stays in your small intestine for 4 to 8
    hours

12
Liver
  • Makes bile to break up fat
  • Stores nutrients, like vitamins and sugars until
    your body needs them
  • Breaks down toxins

13
Gallbladder
  • Temporarily stores bile and releases it into the
    small intestines
  • Storage tank for bile (a greenish-yellow liquid)
  • Helps your body break down and use fats
  • Located under your liver
  • Shaped like a pear

14
Pancreas
  • Makes digestive enzymes
  • Makes hormones that regulate sugar levels
  • Helps you digest food by breaking down sugars

15
Large Intestine
  • No digestion occurs here
  • Water is absorbed from remaining food
  • Bacteria feed on material passing through and
    produce Vitamins (K) vital to our health
  • Waste material, feces, is prepared for
    elimination from the body

16
Other Facts of the Large Intestine
  • Tube that is 5 feet long
  • Gets waste from small intestine
  • Waste stays for 10 to 12 hours

17
Rectum
  • Stores feces until they can be expelled through
    the anus.

18
Large Intestine
19
Videos
  • http//www.neok12.com/video/Digestive-System/zX455
    9475700465170435873.htm
  • http//kidshealth.org/kid/htbw/DSmovie.html

20
Some more videos
  • http//www.youtube.com/watch?vP5lyQUtq1KQ
  • http//kidshealth.org/kid/htbw/_bfs_DSmoviesource.
    html
  • http//www.youtube.com/watch?vq3986Yfl5cU
  • http//kitses.com/animation/swfs/digestion.swf

21
The End!
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