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Presentation 06 - Human Digestion
 

Presentation 06 - Human Digestion

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    Presentation 06 - Human Digestion Presentation 06 - Human Digestion Presentation Transcript

    • Human digestion
    • Human digestive system (General plan)
      Accessory digestive organs
    • Sites of digestion
      Polysaccharides
      (starch, glycogen)
      Disaccharides
      (sucrose, lactose)
      Salivary amylase
      Smaller polysaccharides,
      maltose
      Proteins
      Polysaccharides
      Pepsin
      Pancreatic amylase
      Small polypeptides
      Maltose and other disaccharides
      Pancreatic trypsin and chymotrypsin
      DNA, RNA
      Fat globules
      Pancreatic
      nucleases
      Bile salts
      Disaccharidases
      Fat droplets
      Smaller polypeptides
      Nucleotides
      Pancreatic lipase
      Glycerol, fatty
      acids, glycerides
      Monosaccharides
      Nucleotidases
      Small peptides
      Nucleosides
      Dipeptidases, carboxypeptidase, aminopeptidase
      Nucleosidases, phosphatases
      Nitrogenous bases,
      sugars, phosphates
      Amino acids
    • Digestion in the Mouth
      Salivary glands
      Water
      Some enzymes
      Salivary amylase
      Lysozyme
      Mucus or mucin
      Teeth
    • Swallowing: from mouth to stomach
    • Digestion in the Stomach
      • Muscular sac
      • Churns & mixes food
      • Gastric glands
      • Parietal cells HCl, intrinsic factor
      • Goblet cells mucus
      • Chief cells pepsinogen, weak gastric lipase
      • Gastrin
      • Hormone
      • Controls gastric juices
      • Comes out as chyme (2-6 hours)
    • Liver
      • Secretes bile
      (stored in gall bladder)
      • Emulsifies fats
      Gallbladder
      • Stores, concentrates, and releases bile into duodenum
      • Stimulated by the hormone cholecystokinin (CCK)
    • Pancreas
      Exocrine function
      Acinar cells secrete pancreatic juice
      Amylase
      Lipase
      Trypsin
      Chymotrypsin
      Carboxypeptidase
      Nuclease
      NaHCO3
      Secretin and cholecystokinin (CCK)fr intestinal wall stimulates PJ production
    • Absorption in the small intestine
    • Reabsorption and elimination in the large intestine
      • Areas of the colon
      • cecum
      • rectum
      • anus
      • Absorption of water and electrolytes
      • Concentration & elimination of solids
      • Home for bacteria
      • folic acid
      • vitamin K
      • several B-vitamins
      • gases
    • Liver
      Entero-
      gastrone
      Gall-
      bladder
      Gastrin
      CCK
      Stomach
      Pancreas
      Secretin
      Duodenum
      CCK
      Key
      Stimulation
      Inhibition