1. The Digestive System... Can YOU Stomach it??

2. Purpose:
To enable the absorption of the nutrients needed for growth, maintenance and repair

3. Components of Digestion
Ingestion
the taking in of nutrients
enters by mouth
Digestion
the breakdown of complex molecules into smaller components
Mechanical – done by teeth and stomach
Chemical – done by the mouth, stomach, liver, gallbladder, pancreas, small & large intestine.

4. Elimination The removal of waste from the body
Done by large intestine, rectum and anus

5. Parts of the Digestive System
1. Mouth (oral cavity)
Teeth chew food
Mixes with saliva (salivary gland) to make a bolus
Tongue pushes food to back of mouth for swallowing

6. Parts of the Digestive System
Esophagus
Muscular tube joining mouth and stomach
Lined with tiny hairs (cilia)
Muscle contractions (peristalsis) move food at about 5cm per second

7. Parts of the Digestive System
Stomach
Muscular sac
Sphincters control entry and exit of food
Contains strong acid to digest food (chemical)
Muscles contract to mix food (mechanical)

8. Parts of the Digestive System
Small Intestine
Long, narrow tube system
Where most of digestion takes place
Up to 7m long in adults

9. Parts of the Digestive System
Large Intestine (colon)
Shorter and thicker than SI
Water and minerals are reabsorbed here
End of the line!

10. Parts of the Digestive System
Rectum
Holds waste before removal
Anus
Controls release of feces

11. Speaking of Poop...
TMI (Too Much Information!) MOMENT OF THE DAY!!!

12. Accessory Organs
All help with digestion of food - provide digestive enzymes
Gall bladder
Pancreas
Liver
Liver also produces bile to break down fats
Pancreas produces insulin to help regulate blood sugar

13. Guided Tour of the Digestive System
Check this out! 13

14. Pop Quiz – Label Me!

15. Answers Tongue Esophagus Stomach Duodenum Pancreas Ileum
Large Intestine
Rectum

16. UH OH! Ulcer sore stomach wall
acid creates hole in the mucous lining - irritates muscles
Caused by bacteria that reduce amount of mucous.
STRESS!
Treated with antibiotics

17. Reminder - QUIZ TOMORROW
Cell Theory
Cell Structure and Function - Plant and Animal Cells
Importance of Cell Division
Cell Cycle and Cancer
**Remember: all powerpoint presentations can be found on class website:

18. We’re done…What a RELIEF!