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30 S 1 7 Liver Regulationofnutrients
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30 S 1 7 Liver Regulationofnutrients

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  • 1. Entry slip: What along what structure in what organ does most of the absorption of nutrients take place in the alimentary canal? Lesson 1.7- Describe the homeostatic role of the liver with respect to regulation of nutrient levels in the blood and nutrient storage
  • 2. (pp365-368) of Biology-McGraw-Hill Ryerson) I. Homeostasis (p772): a.The body’s maintenance of a relatively constant internal environment (i.e. water content, O2 level, temperature, etc..) b. Ex: the thermostat in your home functions to keep the temperature “just right”. When the furnace heats the home above a certain temperature, it shuts off. When the temperature falls again, the thermostat senses this and starts up the furnace to keep the home at a near-constant temperature. II. The liver has several homeostatic functions: a. Fat: The human body needs fat. Bile salts produced from the liver help fat
  • 3. get emulsified (remember the detergent with an oily jar) so the fat can be easily used by the body. Its uses are: i. “burned” in cells for energy ii. Used and construction material for hormones and cells iii. Stored for later use in fat cells b. CHO’s: Excess blood-sugar is stored in the liver as “glycogen”. This substance is like heavy syrup and is composed of molecules with many glucose rings attached to each other. When blood-sugar levels go down because the sugar in the blood is used up and the person does not have a meal for a long time, the liver converts glycogen back to simple glucose and deposits it into the bloodstream.
  • 4. c. Protein: excess amino acids are de- aminized (the Nitrogen is removed and excreted) and the rest of the C’s, H’s and O’s are converted to fat. d. Vitamins: excess vitamins A, D, E and K are stored in the liver and released into the blood stream when needed. e. Alcohol: excessive alcohol levels are dangerous to the body. The liver quickly converts the alcohol to an energy source. Homework assignment: Mr. Gustave’s body is short of a few organs and is interviewing for a position as an organ. You are a liver and are applying for a job to work in Mr. Gustave’s body; your competition is a stomach and a small intestine.
  • 5. Write a half-page (at least 100 words) cover letter explaining: 1. Past experiences and accomplishments as a substitute liver. 2. What you would do to help the body with homeostasis. 3. Hand in for marks the next day. 4. Clear writing or printing or size 12 font.

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