Abstract of biorhythms: woman's face and a clock

Abstract of biorhythms: woman's face and a clock

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Credit: OSCAR BURRIEL/SCIENCE PHOTO LIBRARY

Caption: Biological clock. Abstract image depicting human biorhythms, showing a clock super- imposed on a woman's face. Many biological processes are believed to take place under the direction of an internal clock mechanism. These processes vary in a rhythmic way (for example the menstrual cycle, which repeats itself about every 28 days in fertile women and has often been associated with the moon's cycle). Most bio- rhythms, sleeping and waking for example, are based on a daily or circadian (24-hour) cycle and are regulated by hormones such as melatonin and cortisol. The fertile lifespan of a woman is also sometimes portrayed as a biological clock.

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Keywords: abstract, ageing, aging, anatomy, biological, biological clock, biorhythm, circadian rhythm, clock, concepts, conceptual, face and clock, human body, imagery, menstrual cycle, time, time measurement, woman's face

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