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Biological clock

Biological clock

P895/0001

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Credit

SHEILA TERRY / SCIENCE PHOTO LIBRARY SHEILA TERRY / SCIENCE PHOTO LIBRARY

Caption

Composite image representing the human sleep-wakefulness cycle; the pendulum swings between images of a girl asleep and awake. It has been suggested that feedback signals from the cerebral cortex and from the peripheral nerve receptors, by sustaining a particular state, might play an important role in controlling the sleep-wakefulness rhythm. Many biological processes are believed to take place under the direction of an internal clock mechanism. The regulation of biological time is poorly understood and is a subject of current (1990's) research.

Release details

Model release available. Property release not required.

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