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30 S 1 7 Liver Regulationofnutrients

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30 S 1 7 Liver Regulationofnutrients

  1. 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. 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. 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. 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. 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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