031209homework

031209homework - Homework due 3/12/09 Name _ 1. What organs...

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Homework due 3/12/09 Name __________________________________ 1. What organs secrete ghrelin and PYY. Under what conditions is secretion maximal? What message are these hormones sending to the hypothalamus? How do these hormones work in the hypothalamus? 2. Describe the "lipostatic" mechanism in the body that monitors the amount of body fat to regulate hunger and satiety? Try to explain the etymology of lipostat and ponderostat (look at the roots of this word, a dictionary might be helpful). Why is a ponderostat pretty much the same thing as a lipostat in humans? 3. Thought question: Is it possible for a person to experience hunger during the absorptive phase when metabolic fuels are abundantly available? Under what kind of conditions do you think this could happen? Which type of signal might be stimulating this hunger? Explain. 4. What two signals are known to provide information to the brain to get information about the amount of body fat?
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5. Very briefly (one sentence or less) describe how the brain mechanisms that
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031209homework - Homework due 3/12/09 Name _ 1. What organs...

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