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Conceptual image of a clock and a woman's body

Conceptual image of a clock and a woman's body

P890/0521

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Credit

DENNIS POTOKAR / SCIENCE PHOTO LIBRARY DENNIS POTOKAR / SCIENCE PHOTO LIBRARY

Caption

Biological clock. Conceptual image depicting human biorhythms, showing a clock superimposed on a woman's naked body. 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, also controlled by hormones.

Release details

Model release not available. Property release not required.

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