Biological clock

Biological clock

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Caption: Biological clock. Conceptual image of a resting boy lying below a tree seen through a watch face, representing the biological clock. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol.

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Keywords: biological clock, biorhythm, boy, child, circadian clock, circadian rhythm, conceptual, daily rhythms, lifestyle, rest, rest resting, rhythm, sleep, sleep sleeping, watch

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