Lecture+2++Digestion+,+part+1 - Digestion 8/31/11; S.E....

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Digestion 8/31/11; S.E. Fleming Recommended reading: 1 Lecture 2
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Lecture Outline Overview Vocabulary Appetite versus hunger Following the food: Mouth, esophagus Stomach Small intestine Large intestine Accessory Organs 2
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The Big Picture Biochemically, “you are what you eat” is true! Food (solid and liquid) taken into the body is broken down into smaller components that can be assimilated into and used by the body. 3
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Digestion Food Nutrients proteins carbohydrates lipids minerals vitamins water 4
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Food is digested into its components (atoms, molecules) which can be used (assimilated and metabolized) by the body 5
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Digestion, simple definition The process of converting complex foods into small units that can be used by the body 6
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Overview of the Digestive System 7 *= GI Tract # = Accessory organs * * * # #
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The Inside Surface of the GI tract Faces the Outside of the Body Not only transforms food to biologically useful macromolecules but also: Protects against infection Protects against toxins Alters peripheral metabolic responses Alters feeding behavior 8
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Lecture Outline Overview Vocabulary Appetite versus hunger Following the food: Mouth, esophagus Stomach Small intestine Large intestine Accessory Organs 9
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Vocabulary (1) Gastrointestinal tract: hollow tube consisting of the mouth, pharynx, esophagus, stomach, small intestine, large intestine and anus Food – plant or animal material that can be safely consumed Transit time: amount of time it takes food to pass the length of the GI tract 10
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Vocabulary (2) Molecule – a substance that has a defined chemical composition and is not easily reduced to smaller units Absorption – To move a molecule from an an external space (eg. Lumen of intestine) into one
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Lecture+2++Digestion+,+part+1 - Digestion 8/31/11; S.E....

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