Which hormone relates with temperature and sleep-wake cycle?

  • A
    Melatonin
  • B
    Thyroxine
  • C
    Insulin
  • D
    Adrenaline

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Which hormone is secreted more in dark conditions?

From which one of the following,the melatonin is derived?

....... plays a very important role in the regulation of a $24$ hours rhythm of our body.

Which of the following endocrine glands acts as a biological clock and a neurosecretory transducer?

Melatonin is secreted by ..........

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