What term describes the roughly 24-hour internal biological clock that regulates the natural cycle of sleepiness and wakefulness in humans?

Explanation

The circadian rhythm is the body’s internal biological clock, operating on a cycle of roughly 24 hours, that helps regulate the natural pattern of sleepiness and wakefulness, along with various other physiological processes like body temperature and hormone release. This internal rhythm is significantly influenced by external cues, particularly exposure to light and darkness, which is why exposure to bright screens late at night can sometimes disrupt healthy sleep patterns. Disruptions to a person’s normal circadian rhythm, such as those experienced during jet lag or shift work, can lead to noticeable effects on sleep quality, mood, and overall alertness. Explore more Everyday Science MCQs on mcqstutor to keep practicing.