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Abstract image of a clock on a woman's head

Abstract image of a clock on a woman's head

P890/0520

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Credit

VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY

Caption

Biological clock. Abstract image depicting human biorhythms, showing a clock superimposed onto a woman's head. Many biological processes are believed to take place under the direction of an internal clock mechanism. Processes such as wakefulness and tiredness are based on a daily or circadian (24 hour) cycle regulated by hormones such as melatonin and cortisol. Another example is the menstrual cycle, which repeats itself roughly every 28 days in fertile women.

Release details

Model release available. Property release not required.

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