021009homework - Homework due 2/10/08 Name _ 1. What is the...

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Homework due 2/10/08 Name ____________________________________ 1. What is the relationship between the cyclicity of circadian clocks outside the brain and that of the SCN? How does the SCN control the clocks in tissues outside the CNS? What happens to the phase relationships of these other clocks in relation to each other in the absence of a functioning SCN? Why? 2. Describe the molecular mechanisms by which cortisol serves as a signal from the SCN to the circadian clocks outside the brain. What tissues have glucocorticoid receptors and what area of the brain doesn't (look in book? Why might this relationship be expected)? Why are the circadian clocks outside the brain phase/delayed (have their "clock proteins" peak at a slightly later time) in relation to the SCN? 3. What biological processes in the body show circadian rhythms? What biological processes don't? What do you suppose is the adaptive purpose of all these circadian rhythms in bodily processes?
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This note was uploaded on 11/03/2009 for the course BIOS 277 taught by Professor Nyby during the Spring '09 term at Lehigh University .

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021009homework - Homework due 2/10/08 Name _ 1. What is the...

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