Digestion and Absorption - PowerPoint PPT Presentation

1 / 6
About This Presentation
Title:

Digestion and Absorption

Description:

Digestion and Absorption Digestion Digestion-The bodily process of breaking food down into simpler compounds the body can use. The Digestive Tract- a tube, about 30 ... – PowerPoint PPT presentation

Number of Views:128
Avg rating:3.0/5.0
Slides: 7
Provided by: KISD3
Category:

less

Transcript and Presenter's Notes

Title: Digestion and Absorption


1
Digestion and Absorption
2
Digestion
  • Digestion-The bodily process of breaking food
    down into simpler compounds the body can use.
  • The Digestive Tract- a tube, about 30 feet, that
    extends from the mouth to the anus. It contains
    the esophagus, the stomach, and the small and
    large intestine. These parts work together to
    both mechanically and chemically help the body
    use food.

3
The Digestion Process
  • 2 phases- Mechanical and Chemical
  • Mechanical- Begins in the mouth.
  • 1.Teeth chew and break down food.
  • 2.Contractions of the muscular walls of the
    digestive tract carry on the mechanical action.
    These contractions mix food particles and break
    them into smaller pieces.
  • 3.Waves of contraction, peristalsis, the muscles
    push food through the digestive tract.
  • Emotions such as sadness, depression and fear
    can slow this process down. Anger and aggression
    can speed up this process.

4
The Digestion Process
  • Chemical Phase-
  • Also begins in the mouth. As you chew food is
    mixed with saliva, an enzyme-containing liquid.
    Saliva moistens the food partials and begins to
    break down starches.
  • In the stomach, gastric juices containing
    hydrochloric acid are secreted. These juices
    break down food further. Carbohydrates leave
    the stomach first, Proteins are second, followed
    by fats. As a result you will feel hungry sooner
    after a meal high in Carbs.

5
The Digestion Process
  • 3. Next the food leaves the stomach and enters
    the small intestine. Here several juices
    intestinal, pancreatic, and bile break down the
    food.
  • 4. Then indigestible residues, bile pigments,
    other waste and water travel into the large
    intestine. The large intestine acts as a storage
    area. Eventually the body will excrete these
    material in the feces.

6
The Absorption Process
  • The body can absorb water, ethyl alcohol, and
    simple sugars directly from the stomach. They
    pass through the stomach walls and into the
    bloodstream. However, most absorption takes place
    in the small intestine through capillaries.
Write a Comment
User Comments (0)
About PowerShow.com