Biology · Endocrine System
Which hormone, secreted by the pineal gland, primarily regulates the human sleep-wake cycle?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Melatonin✓
- 2Growth Hormone
- 3Adrenaline
- 4Thyroxine
Correct answer
Melatonin
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