Biology · Endocrine System
The sleep-wake cycle in humans is regulated by a hormone secreted by the pineal gland. Identify this hormone.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Thyroxine
- 2Adrenaline
- 3Melatonin✓
- 4Cortisol
Correct answer
Melatonin
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