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Digistive system

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  • 1. Digestive system
    Matspjälkningsapparaten
    Catherine Mortimer-Hawkins, Edsbergsskolan
  • 2. Whatdoweeat and why?
    The main nutrients the body needs are:
    • carbohydrates (kolhydrater) for energy;
    • 3. proteins (proteiner) for growth and repair;
    • 4. fats (fetter) to store energy;
    • 5. vitaminsand minerals to keep the body healthy.
  • What is carbohydrates, proteins and fats?
    one sugar molecule
    Carbohydrate
    molecule
    protein
    molecule
    one
    amino acid
    fat
    molecule
    fatty acids
    glycerol
  • 6. But how does a 9m tube fit into a space, which is less than a metre long?
    The digestive system is really one long tube with an opening at each end.
    Stretched out it is a 9m tube!
    mouth
    anus
  • 7. Okidoki!! Let’s go for a ridethrough your body!
  • 8. Digestion begins in the mouth where food is broken down by the teeth. This is called mechanical breakdown. The small parts of food are mixed with saliva and swallowed.
  • 9. food enters
    from the gullet
    muscle
    tissue
    food leaves
    the stomach
    After food is swallowed it enters the stomach, which is basically a muscular bag filled with hydrochloric acid.
    Two things happen to food in the stomach:
    • the chemical breakdown of food begins;
    • 10. microbes are destroyed.
  • The stomach
    Digestive enzymes are the chemicals that break large food molecules into smaller molecules. Otherwise the molecules are to big for our body to take up!
  • 11. Duodenum - tolvfingertarm
    Here the digestedfood is mixed with bile from the gallbladder and juices from the pancreas.
    The bile:
    Breaks up larger fat drops
    to smallerdroplets
    The juices from the pancreas:
    Neutralize the acid from the stomach
    Mix the digestedfood with enzymes
  • 12. Enzymes
    sugar
    molecules
    Pepsin
    long carbohydrate molecule
    +
    glycerol
    long proteinmolecule
    amino acid molecules
    Lipas
    fatty acids
    Amylas
  • 13. The small intestine
    It is in the small instestine the small molecules
    gets through the thinwalls and reaches
    the bloodvessels.
    The walls are folded in so calledvilli (tarmludd).
  • 14. The largeintestine
    Here in the largeintestine water is sucked
    back into the body.
    If this doesn’t work… then you get diarrhea.
    Colibacterialives in the largeintestine and helpmaking K-vitamins.
    Theyhelp with the last of the digestion and thenalso make methane gas….
    …a fart in otherwords!
  • 15. The anus
    The ex-foodleaves the body
    through the anus.
    When the pooreaches the anus
    signals are sent to the brain to
    relax the musclesand the poo
    is pressed out.
  • 16. Glossary
    • carbohydrate –A nutrient in food that provides energy.
    • 17. enzyme –A chemical that helps digestion by breaking large molecules into smaller ones.
    • 18. fat – A nutrient in food that provides a store of energy.
    • 19. large intestine –The organ where water is removed from undigested food.
    • 20. minerals –Compounds infood that provide the elements needed in small amounts for a healthy diet.
    • 21. protein –A nutrient in food needed for growth and repair.
    • 22. small intestine –The organ where digestion is completed and digested food molecules are absorbed.
    • 23. stomach –The organ where food is mixed with acid and enzymes.
    • 24. vitamins –Substances found in food that are needed in