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

  • A
    calcitonin
  • B
    prolactin
  • C
    adrenaline
  • D
    melatonin

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Artificial light, extended work-time and reduced sleep-time disrupt the activity of

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

The hormone $Melatonin$ is produced by the:

The pineal gland is associated with:

The recently discovered hormones, melatonin and serotonin, are secreted at the ends of nerve fibres by the activity of:

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