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What hormone is thought to play a role in circadian rhythms?

a) Serotonin
b) Dopamine
c) Melatonin
d) Adrenaline

1 Answer

3 votes

Final answer:

Melatonin is the hormone that is thought to play a role in circadian rhythms. It is produced by the pineal gland and is involved in regulating sleep-wake cycles.

Step-by-step explanation:

The hormone that is thought to play a role in circadian rhythms is melatonin (option c). Melatonin is produced by the pineal gland and is involved in regulating sleep-wake cycles. Its release is stimulated by darkness and inhibited by light. When light levels decline, melatonin production increases, promoting drowsiness.

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