"Brain sand" is found in .....

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

$I.$ Sleep-wake cycle, $II.$ Body temperature, $III.$ Pigmentation, $IV.$ Metabolism, $V.$ Defense capability. All of the above-written activities are influenced/regulated by:

The function of the pineal body is to

The pineal gland originates from the:

Identify the hormone with its correct matching of source and function.