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The human digestive system.
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| Submitted: Mon Oct 20 2003
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The Human Digestive System The Mouth Chewing makes a larger surface area of the food for the enzymes in the mouth to attack. The Small Intestine How is the structure of the wall of the ileum (small intestine) adapted to its function in the absorption of the products of digestion? * Large Surface area * Moist surface * Thin (epithelial) surface/ short absorption pathway * Long/ folds (increasing surface area) * Villi * Microvilli * Longer intestine * Lacteal * Capillary network in villus/ good blood supply * Mitochondria to supply ATP/ energy for transport * Carrier proteins in membranes. * Maltase is produced in the small intestine Sugar Absorption in the small intestine * Diffusion in capillaries * Active transport/ facilitated diffusion involved * ATP used by active transport * Disaccharides/ enzymes in cell surface membrane * Glucose/ monomers/ monosaccharides actively transported into epithelial cells via protein carriers/ channels (in membrane) * Facilitated diffusion from epithelial cell/ towards blood enzymes and digestion in humans. enzymes different enzymes are required for the digestion of different...
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