09b biorhythm regulation-2010 update

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09b biorhythm regulation-2010 update

  1. 1. Pineal Gland
  2. 2. Pineal Gland Function shaped like a pine cone light absorbed by the retina is transferred and interpreted by suprachiasmatic nucleus (SCN)  SCN passes information on to pineal gland secretes melatonin hormone  regulates circadian rhythms – light-dependent rhythms
  3. 3. Suprachiasmatic Nucleus
  4. 4. Pineal Gland
  5. 5. Melatonin tryptophan derived hormone melatonin production inhibited in the presence of light  amount of light detected by SCN proportional to the amount of melatonin produced in the evening
  6. 6. Melatonin
  7. 7. Melatonin & Sleep Cycles increased melatonin increases sleepiness can be used as a treatment for:  insomniacs  shift workers  jet lag  blind individuals melatonin levels change with the seasons  what happens above the Arctic circle?
  8. 8. Melatonin & Reproduction some animals have distinct breeding seasons melatonin inhibits GnRH  reproductive organs are inhibited higher melatonin during shortened days  decreases breeding in the winter
  9. 9. Videoclip http://www.youtube.com/watch?v=EUyBDGgsk_I

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