The pineal gland of the human brain secretes melatonin,which is concerned with:

  • A
    Anger
  • B
    Body temperature
  • C
    Colouration of skin
  • D
    Sleep

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

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"Pinealocytes" are found in which of the following?

Which hormone is secreted more in dark conditions?

The $24$ hour (diurnal) rhythm of our body,such as the sleep-wake cycle,is regulated by the hormone:

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