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2.3 Human Digestive System Pn. Rohaillah binti Mohd Jabid SMJK Chong Hwa,KL

2.3 human digestive system

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  1. 1. 2.3 Human Digestive System Pn. Rohaillah binti Mohd Jabid SMJK Chong Hwa,KL
  2. 2. 1. We actually eat mixture of carbohydrates, proteins and fat. 2. All this must be broken into small molecule. 3. This will involve the process of digestion.
  3. 3. Digestion 1. Is the process of breaking down large molecule of food into small molecule. 2. This is important, so that the small molecule can be absorbed into the body through the bloodstream.
  4. 4. 3. Digestion involve : a) Alimentary canal or gut (tube from mouth to anus) b) Liver c) Pancreas Secrete the enzyme to break down the food that we eat Liver Pancreas
  5. 5. 4. Digestion involve 2 process: a) Physical digestion ( No chemical-using teeth) b) Chemical digestion ( Use chemical- enzyme)
  6. 6. 5. Three main enzyme in the human digestive system process: a) Amylase ( Starch -> Glucose) b) Protease ( Protein -> Amino acid) c) Lipase ( Fat -> Fatty Acid + Glycerol)
  7. 7. 1. Food chew into smaller pieces via physical digestion. 2. Salivary amylase from the salivary gland will breakdown Starch into Maltose( Kind of sugar) 1. Mouth
  8. 8. 2. Oesophagus 1. No enzyme takes place here. 2. The food will become bolus 3. The food move from mouth to stomach via wave-like movement ( Peristalsis).
  9. 9. 1. In stomach, gastric juice will release. 2. Gastric juice contain Protease and Hydrochloric acid. 3. Protease enzyme will breakdown protein into polypeptides or peptones 4. Hydrochloric acid will: a) Stop the amylase b) Give acidic medium for protease action c) Kill bacteria 3. Stomach
  10. 10. 1. Duodenum is the first part of small intestine. 2. Bile- greenish fluid produce by liver and stored in gall bladder. 3. Function of bile is to emulsifies fats into oil droplets for lipase action. 4. Duodenum
  11. 11. 1. Pancreas will produce Pancreatic juice that contain amylase, protease and lipase enzyme. 2. Pancreatic amylase breakdown starch to maltose 5. Pancreas
  12. 12. 3. Protease breakdown proteins to polypeptides 4. Lipase breakdown fat into fatty acids and glycerol
  13. 13. 1. Small intestine will secrete Intestinal juice that contain maltase, protease and lipase. 2. Maltase will breakdown maltose into glucose. 6. Small intestine
  14. 14. 3. Protease breakdown polypeptides into amino acid. 4. Lipase breakdown fats into fatty acids and glycerol.
  15. 15. Conclusion for amylase.. Starch Amylase (Mouth & Duodenum) Maltose Maltase (Small Intestine) Glucose End Product
  16. 16. Conclusion for protease.. Protein Protease (Stomach & Duodenum) Polypeptides Protease (Small intestine) Amino Acid End Product
  17. 17. Conclusion for lipase.. Fat Lipase (Duodenum & Small Intestine) Fatty acid + Glycerols End Product