The concept of 'circadian rhythm' refers to the innate biological cycles that regulate physiological processes in living organisms, typically synchronized with the 24-hour day-night cycle. Recent research has revealed that these rhythms are not merely responses to external light cues but are driven by an internal 'master clock' located in the suprachiasmatic nucleus of the brain. However, modern lifestyles, characterized by irregular sleep patterns, shift work, and excessive artificial light exposure, often disrupt this internal timing. Such desynchronization has been linked to metabolic disorders, cognitive impairments, and even increased cancer risk. Interestingly, studies suggest that timed eating and consistent exposure to natural light can help realign the internal clock with the external environment, offering a non-pharmacological strategy to mitigate the negative health impacts of circadian disruption.
❓ According to the passage, what is a primary cause of circadian rhythm disruption in modern societies?
A. The absence of a biological master clock in some individuals
B. Irregular sleep patterns and exposure to artificial light at inappropriate times
C. The overconsumption of pharmacological sleep aids
D. Natural light exposure during daytime hours
✅ Correct Answer
B. B. Irregular sleep patterns and exposure to artificial light at inappropriate times