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Small Intestine Small Intestine Most chemical digestion takes place here Absorb nutrients Other organs assist 1st part of the SI is the duodenum Small Intestine Villi – tiny fingerlike structures cover the inner surface of small intestine; absorbs nutrients into the blood and carry through the body 3 organs assist: (these substances go to the duodenum) 1. Liver -produces bile 2. Gall bladder -stores bile -sends bile to the SI -bile breaks down fat droplets 3. Pancreas -produces pancreatic juice & sends to the SI -has enzymes for starch and protein -begins chemical digestion of fat http://www.medicaldoctorratings.com/41-16-Duodenum-L%5B1%5D.gif Liver Stomach Gall bladder Duodenum Pancreas The small intestine The small intestine has 3 enzymes to complete digestion: Amylase breaks starch down into glucose. Protease breaks protein down into amino acids. Lipase breaks fats down into fatty acids and glycerol Small Intestine has a large surface area (increases absorption) The tube is over 6 meters long The inner wall of the tube has bends in it The wall is covered in villi (small fingerlike structures) Outer wall Inner wall Pathway for Food Absorption 2: Villi Outer wall Inner wall Pathway for Food