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

  • A
    Pineal gland
  • B
    Parathyroid gland
  • C
    Pituitary gland
  • D
    Thyroid gland

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The diurnal rhythms are regulated by . . . . . . .

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

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