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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. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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