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Digestive System

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Digestive System. Breaks down food into nutrients. Made up of: Mouth. Esophagus. Stomach ... Digestive Tract. Food travels through the following organs: 1. ... – PowerPoint PPT presentation

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Title: Digestive System


1
Digestive System
  • Breaks down food into nutrients.

2
Made up of
  • Mouth
  • Esophagus
  • Stomach
  • Small intestine
  • Large intestine
  • Rectum
  • Anus

Food does not travel through
  • Salivary glands
  • Liver
  • Pancreas
  • Gall bladder

3
Types of Digestion
  • Mechanical Digestion
  • Grinding and mashing of food into smaller
    pieces.
  • Chemical Digestion
  • Breaking down of food into nutrients using acids
    and enzymes

4
Proteins- Broken down into amino acids
Used to build muscle Carbohydrates- Broken do
wn into simple sugars Used for energy Fats-
Broken down into fatty acids Used for stored e
nergy
5
Digestive Tract
  • Food travels through the following organs

1.Mouth 2.Esophagus 3.Stomach 4.Small intestine

5.Large Intestine 6.Rectum 7.Anus
6
1. Mouth
  • Digestion begins here. Both mechanical and
    chemical digestion take place.
  • Teeth will chew and mash food into smaller
    pieces. (mechanical digestion)
  • Salivary glands found around your mouth produce
    saliva that begin chemical digestion of
    carbohydrates.

7
2. Esophagus
  • The esophagus is a long tube that connects the
    mouth to the stomach.
  • Food moves through the esophagus by peristalsis.
  • Peristalsis is a rhythmic muscle contraction that
    squeeze food down.

8
3. Stomach
Bag-like organ where digestion occurs.
  • Mechanical digestion takes place when the stomach
    churns.
  • Chemical digestion takes place when acids
    breakdown food into nutrients.
  • After 2-4 hours your food becomes a soupy mixture
    called chyme.

9
4. Small Intestine
Long but narrow tube where final digestion takes
place.
  • Chemical digestion takes place in the small
    intestine. Enzymes digest proteins and fats.
  • Nutrients are absorbed into the bloodstream
    through villi.
  • Villi are finger-like projections found in the
    small intestine.

Villi
10
Bile
  • Bile helps to digest fats in the small
    intestine.
  • Bile is made in the liver and stored in the gall
    bladder.

11
Pancreas
  • The pancreas releases chemicals (pancreatic
    juices) into the small intestine to help
    digestion.
  • Stomach acid is neutralized with bicarbonate
    before it enters the small intestine.

12
5. Large Intestine
  • Undigested food ends up in the large intestine.
  • Excess water is removed from undigested food to
    create solid waste.
  • 6. Rectum -Solid waste or feces is stored here.
  • 7. Anus -Solid waste leaves the body through here.

13
mouth
teeth
salivary glands
esophagus
stomach
liver
pancreas
gall bladder
large intestine
small intestine
anus
14
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