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Diurnal rhythm of the body is maintained by (a) melatonin (b) isthmus (c) PTH

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Diurnal rhythm of the body is maintained by

(a) melatonin

(b) isthmus

(c) PTH

(d) norepinephrine

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Correct answer: (a) melatonin

Explanation:

Pineal gland secretes melatonin.

It plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body.

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