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Kaplan Qbank USMLE



Author8 Posts
  #1

Which neurotransmitter is the source of melatonin ?

  #2

serotonin

  #3

smiling face

  #4

dopamin?

  #5

Melatonin is produced especially at night in the pineal gland. Its secretion is stimulated by the dark and inhibited by light. Tryptophan is converted to serotonin and finally converted to melatonin which is an Indole. The suprachiasmatic nuclei (SCN) of the hypothalamus have melatonin receptors and melatonin may have a direct action on SCN to influence "circadian" rhythms.

  #6

you are right guest.
Thanks

  #7

ya..pineal gland is called third eye...retinoblastoma in children may be associated with pinealomas....trilateral retinoblatomas 8)

  #8

that was a good point.
Thanks







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