The concept of 'circadian rhythm' refers to the internal biological clock that regulates the sleep-wake cycle and other physiological processes over a 24-hour period. Recent research has revealed that this rhythm is not solely controlled by the suprachiasmatic nucleus in the brain, but also by peripheral clocks in organs such as the liver and muscles. These peripheral clocks can be influenced by feeding patterns, exercise, and temperature, independent of light cues. Disruption of circadian rhythms, often caused by shift work or jet lag, has been linked to metabolic disorders, cardiovascular diseases, and even cognitive decline. Understanding the interplay between central and peripheral clocks is crucial for developing interventions to mitigate these health risks.
❓ According to the passage, which of the following statements is TRUE about circadian rhythms?
A. They are exclusively regulated by the suprachiasmatic nucleus in the brain.
B. Peripheral clocks are unaffected by external factors like feeding and temperature.
C. Disruptions in circadian rhythms may contribute to metabolic and cardiovascular problems.
D. Light is the only environmental cue that influences all biological clocks.
✅ Correct Answer
C. C. Disruptions in circadian rhythms may contribute to metabolic and cardiovascular problems.
