Biological clock

Biological clock

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Credit: TONY CRADDOCK/SCIENCE PHOTO LIBRARY

Caption: Biological clocks. Abstract conceptual computer artwork of clocks superimposed on human faces. Many biological processes are believed to take place under the direction of an internal 'biological' clock. These processes vary in a rhythmic way, for example the menstrual cycle, which repeats itself about every 28 days in fertile women. Most biorhythms, sleeping and waking for example, are based on a daily or circadian (24-hour) cycle. This image could also represent the 'face of time'.

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Keywords: abstract, anatomy, artwork, biological clock, biorhythm, biorhythms, circadian rhythm, clocks, concepts, conceptual, face of time, faces, heads, human body, illustration, imagery, measurement, profile, profiles, rhythms

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