Practice question
Question
The hormone involved in rhythmic activities, such as day/night and seasonal changes is:
Explanation
Melatonin secreted by pineal gland transduces photoperiodic information, peaking in darkness. It regulates circadian rhythm, sleep-wake cycle, and seasonal reproduction via SCN signaling. Suprachiasmatic nucleus entraining through melatonin receptors maintains day-night physiological oscillations.
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