2-HumanBodySpring2016-3 - Chapter 3 Digestion from meals to...

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Chapter 3 Digestion: from meals to molecules
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Organization of Life Fig 3.1
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Organization of Life Fig 3.1
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Organ Systems A group of organs that perform an overall function Table 3.1 Digestive aka gastrointestinal Cardiovascular Lymphatic Urinary
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Digestive system Digestion Large molecules are mechanically and chemically broken down into small molecules Secretions start when you THINK about food: cephalic phase Absorption Substances are taken up from the GI tract and enter the blood or lymph
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pH Measure of hydrogen ion concentration in fluid (H + ) Scale of 1-14 7 = neutral Check out “How it Works” in WileyPlus Acid/Base Balance
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Laulima Resources
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Enzymes Proteins that catalyze chemical reactions Break down nutrient molecules Usually end in –ase Protease, lipase, amylase Fig 3.3
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Overview of the Digestive System Fig 3.2
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Overview of the Digestive System Mouth Esophagus Stomach Small Intestine Large Intestine ~4 c or 1 L capacity 2-4 hrs. 3-10 hrs. Up to 72 hrs. Duodenum 10 in. Jejunum 4 ft. Ileum 5 ft. 3.5 ft. 10 inch tube Length of Time Size of Organ
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The details Organ Movements Secretions /Enzymes Absorption Mouth Chewing Saliva Amylase None Esophagu s Peristalsis Connects mouth and stomach None None
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The details Organ Movements Secretions /Enzymes Absorption Stomach Mixing, Peristalsis breaking down food Gastric acid Proteases Some water Alcohol Small Intestine Peristalsis Segmentation Bile CHO-enzymes Lipase Protease Bicarbonate Most water Glucose Fatty acids Amino acids Vitamins Minerals Alcohol
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The details Organ Movements Secretions /Enzymes Absorption Large intestine Peristalsis Segmentation Bacteria live here! Water, Minerals, Bacterial products Rectum Peristalsis “Mass movement” Defecation None None
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The details Organ Movements Secretions/ Enzymes Absorption Liver None Bile None Gall Bladder None Stores the bile None Pancreas None Bicarbonate, Enzymes for CHO, fat, protein None
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Peristalsis Muscle contractions that move food through the GI tract (Fig 3.5)
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Peristalsis Check out this animation natomyvideos/000097.htm
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