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

Where is the pineal gland located?

The function of the pineal body is to

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

Select the correct match regarding the source and function of the hormone.

George comes on a vacation to India from the $U.S.$ The long journey disturbs his biological system and he suffers from jet lag. What is the cause of his discomfort?