Melatonin is concerned with how many of the following functions?a. Sleep wake cycleb. Menstrual cyclec. Immune responsed. Pigmentatione. Metabolism

Melatonin plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body. For example, it helps in maintaining the normal rhythms of sleep-wake cycle, body temperature. In addition, melatonin also influences metabolism, pigmentation, the menstrual cycle as well as our defense capability.