What is the duration of circadian rhythms, typically observed in human bodies?

• A. 12 hours
• B. 24 hours
• C. 25-30 hours
• D. 48 hours

Answer: (B)

Circadian rhythms are biological processes that follow a roughly 24-hour cycle, which is why the duration of circadian rhythms in human bodies is best represented by a 24-hour period. This cycle is influenced by external cues, such as light and temperature, and helps regulate various physiological processes including sleep-wake cycles, hormone release, and body temperature. The natural human circadian rhythm is slightly longer than 24 hours, approximately 24.2 hours, but the influence of the environment synchronizes it to a 24-hour cycle, aligning with the day-night cycle. This alignment is crucial for maintaining health and well-being, as disruptions in circadian rhythms can lead to various health issues, including sleep disorders and metabolic problems.