According to recent knowledge,the pineal body is considered as

  • A
    $A$ vestigial organ
  • B
    An organ of intelligence
  • C
    An endocrine gland
  • D
    An organ of involuntary action

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"Pinealocytes" are found in which of the following?

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

$P$ is a small,round,reddish structure located on the dorsal side of the forebrain. It contains a stalk and releases a hormone $Q$ which controls the diurnal rhythm of the body. $P$ and $Q$ are

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

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

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