Conceptual image of a clock and a woman's body

Conceptual image of a clock and a woman's body

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Credit: 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.

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Keywords: anatomy, biological, biological clock, biorhythm, body, circadian rhythm, clock, concepts, conceptual, female women females, human body, imagery, menstrual cycle, time, womanly feminine activity

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