DigestionDone by: Ooi huiying
Digestion The  process whereby large food  molecules are broken down into smaller,  soluble, diffusible, simpler forms th...
Mouth & Buccal CavityMouthThe opening that food enters & leads to thebuccal cavity.Buccal CavityTongue- Mixes food with ...
Oesophagus ( gullet) Consist  of the inner circular muscles and outer  longitudinal muscles. Does not digest food. It i...
Stomach   A distensible, muscular bag with thick and well-    developed muscular walls.   It creates powerful muscular c...
Small intestine   6m long connected with liver and pancreas.   Consists of : U-shaped duodenum                   Jejunum...
Villus Finger-like            structures which increases  surface area for digestion
Liver Produces   a yellowish-green fluid called  bile. Bile does not contain enzymes but helps in  fat digestions throug...
Pancreas Situated   between stomach and small  intestine. Secretes pancreatic juice (alkaline)  containing amylase, prot...
Large intestine About  1.5 m long Absorbs remaining water and minerals  salts.
Rectum Near     solid waste called Faeces is temporarily stored in the rectum.
Anus Faeces  is forced out of the gut through  anus. (Egestion) Faeces contains mainly digested food  and unabsorbed mat...
Enzymes & their reactants Enzymes    reaction Protease   Proteins- Amino acids Lipase     Fats- glycerol + fatty acids Amy...
Enzymes. Pancreatic    juice : Amylase, maltose  protease, lipase. Intestinal juice : Maltose, protease, lipase
Digestion.ppt my own slides
Digestion.ppt my own slides
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Digestion.ppt my own slides

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Digestion.ppt my own slides

  1. 1. DigestionDone by: Ooi huiying
  2. 2. Digestion The process whereby large food molecules are broken down into smaller, soluble, diffusible, simpler forms that can be absorbed into our body. Physical-Mechanical breakdown of food into smaller particle Chemical- Enzymatic hydrolysis of food substances
  3. 3. Mouth & Buccal CavityMouthThe opening that food enters & leads to thebuccal cavity.Buccal CavityTongue- Mixes food with saliva (Amylase) - Rolls food into Bolus - Pushes food down the PharynxTeeth- Chews food into smaller pieces for enzymatic reactions. (mastication)
  4. 4. Oesophagus ( gullet) Consist of the inner circular muscles and outer longitudinal muscles. Does not digest food. It is a muscular tube that pushes food down the body through peristalsis. Peristalsis is the strong and rhythmic movement. The inner circular muscles relaxes and the outer longitudinal muscles contracts, the lumen widens for food to enter. When the inner circular muscles contracts and the outer longitudinal muscles relaxes, the food is pushed forward.
  5. 5. Stomach A distensible, muscular bag with thick and well- developed muscular walls. It creates powerful muscular contractions called churning, which mixes food with gastric juices to form chyme. Gastric juice : Hydrochloric acid Protease(Digest proteins) Acidic environment: To kill germs & pasticides. Provide an optimum environment for protein digestion (Ph 1-2.5). Stop action of salivary amylase
  6. 6. Small intestine 6m long connected with liver and pancreas. Consists of : U-shaped duodenum Jejunum ileum Bile Pancreatic juice : Pancreatic amylase, Pancreatic lipase, protease Intestinal juice: Peptidase,maltase,lipase Mucus is produced.
  7. 7. Villus Finger-like structures which increases surface area for digestion
  8. 8. Liver Produces a yellowish-green fluid called bile. Bile does not contain enzymes but helps in fat digestions through the process of emulsification. Emulsification is the breaking down of fats molecules into smaller droplets to increase surface area for fat digestion. Bile is temporarily stored in gall bladder.
  9. 9. Pancreas Situated between stomach and small intestine. Secretes pancreatic juice (alkaline) containing amylase, protease. Alkaline juice neutralizes the acid in the food from stomach.
  10. 10. Large intestine About 1.5 m long Absorbs remaining water and minerals salts.
  11. 11. Rectum Near solid waste called Faeces is temporarily stored in the rectum.
  12. 12. Anus Faeces is forced out of the gut through anus. (Egestion) Faeces contains mainly digested food and unabsorbed material. Faeces contains dead bacterial, cellulose, mucus, cholestrol,water.
  13. 13. Enzymes & their reactants Enzymes reaction Protease Proteins- Amino acids Lipase Fats- glycerol + fatty acids Amylase Starch- maltose Maltase Maltose- glucose
  14. 14. Enzymes. Pancreatic juice : Amylase, maltose protease, lipase. Intestinal juice : Maltose, protease, lipase

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