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Zeitgeber

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Biological Clock
Physiology An organism’s internal timer that sets biological rhythms—e.g., metabolism, sleep-wake cycles, and photosynthesis
Vox populi As currently used, that which ticks away the time left for a woman to have babies, ideally before age 40

zeitgeber
Zeit, German, time, geber, keeper A factor in the environment with a periodicity, capable of synchronizing the endogenous circadian rhythm into a 24-hr cycle; without zeitgebers, the free-running human clock is 25.3 hrs. See Circadian rhythm, Jet lag, Shift work, Sleep disorders. Cf REM sleep.


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The light-dark cycle is the most important zeitgeber or time-cue for resetting the sleep/wake rhythm to the 24-hour day, with other environmental cues such as regular social interactions and meals acting as secondary zeitgebers.
Any drug with significant zeitgeber (chronobiotic) properties would be expected to produce a parametric modulation of free-running period, particularly (as is the case for H.
Magnetic field of the Earth as additional Zeitgeber for endogenous rhythms?
 
 
 
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