09b biorhythm regulation

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09b biorhythm regulation

  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 is inhibited in the presence of light  amount of light detected by SCN is 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

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