I. Sleep-wake cycle,II. Body temperature,III. | vedclass

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(A) The pineal gland secretes a hormone called melatonin. Melatonin plays a very important role in the regulation of a $24$-hour (diurnal) rhythm of o

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Pineal gland

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(A) The pineal gland secretes a hormone called melatonin. Melatonin plays a very important role in the regulation of a $24$-hour (diurnal) rhythm of our body. It helps in maintaining the normal rhythm of the sleep-wake cycle and body temperature. In addition,melatonin also influences metabolism,pigmentation,the menstrual cycle,as well as our defence capability.

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

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