Question

Hormone that maintains the normal rhythms of the sleep-wake cycle.

• A. Adrenaline
• B. Cortisol
• C. Melatonin
• D. Thyroxine

Hint:

Melatonin supplements can be used to treat sleep disorders such as jet lag and insomnia.

Answer 1

The Correct Option is C

To solve the problem, we need to identify the hormone that regulates the normal rhythms of the sleep-wake cycle.

1. Understanding the Sleep-Wake Cycle:
The sleep-wake cycle is regulated by various factors, including the circadian rhythm, which is influenced by specific hormones. The hormone responsible for maintaining the normal rhythms of the sleep-wake cycle is Melatonin.

2. Analyzing the Options:
Let's evaluate each hormone and its role in the sleep-wake cycle:

• Adrenaline: Adrenaline is a stress hormone that increases heart rate and prepares the body for 'fight or flight' responses, not directly involved in the sleep-wake cycle.
• Cortisol: Cortisol is a hormone released in response to stress and also helps regulate metabolism, but it is not primarily responsible for the sleep-wake cycle.
• Melatonin: Melatonin is the key hormone that helps regulate sleep patterns. It is produced in response to darkness and helps maintain the circadian rhythm.
• Thyroxine: Thyroxine is a thyroid hormone that regulates metabolism and growth, but it is not directly involved in the sleep-wake cycle.

3. Conclusion:
The hormone that regulates the normal rhythms of the sleep-wake cycle is Melatonin.

Final Answer:
The correct answer is (C) Melatonin.