lecture 13 eating

lecture 13 eating - 11/3/2008 Lecture 13: The Biology of...

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11/3/2008 1 Lecture 13: The Biology of Eating Overview 1. Review 2. Sleep disorders 3. Digestion 4. CNS control on eating behavior Eating Our bodies are able to regulate our intake of food to preserve our bodily functions in an appropriate manner. – Initiate eating when the body needs food – Terminate eating when we are full or reach satiety (the state of feeling full or satisfied, relative to hunger or thirst). Energy Needs • Nutritional substances – Carbohydrates –Fats –Prote
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11/3/2008 2 The Digestive Process – When chewing food, saliva is secreted; food is broken into smaller pieces. – Food passes into the stomach via the esophagus where stomach acid and enzymes break down food. – Food is passed into the small intestine where enzymes break it into smaller molecules smaller molecules absorbed by the intestine. – Anything not absorbed is passed into the large intestine in preparation for elimination. Insulin From pancreas
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11/3/2008 3 • Fats are most efficient for energy storage One gram of fat stores twice – One gram of fat stores twice as much energy as one gram of glycogen – Fat does not attract and hold as much water as glycogen, and so provides denser energy storage Hypothalamus in Hunger and Satiety
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11/3/2008 4 Hypothalamus in Hunger and Satiety — Lesions to areas within the hypothalamus can cause anorexia or obesity • Lesion in the LH led to
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This note was uploaded on 02/05/2011 for the course PSY 370 taught by Professor Zalava during the Fall '09 term at CSU Long Beach.

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lecture 13 eating - 11/3/2008 Lecture 13: The Biology of...

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