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A zeitgeber (/ ˈ (t) s aɪ t ɡ eɪ b ər, ˈ z aɪ t-/ (T)SYTE-gay-bər, ZYTE-, German: [ˈtsaɪtˌɡeːbɐ]) is any external or environmental cue that entrains or synchronizes an organism's biological rhythms, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles.
Biological rhythms are endogenous; they persist even in the absence of environmental cues as they are driven by an internal mechanism, the circadian clock being the best characterized. Of the several possible cues, known as zeitgebers (German for 'time-givers'), which can contribute to entrainment of the circadian clock, light has the greatest ...
Endogenous: Growing or working from within an organism; intrinsic. Entrainment: The process an organism undergoes when synchronizing endogenous rhythms to a Zeitgeber. Free-Running Period (FRP): The length of time it takes for an organism's endogenous rhythm to repeat without Zeitgebers in constant conditions (LL or DD).
While circadian rhythms are defined as regulated by endogenous processes, other biological cycles may be regulated by exogenous signals. In some cases, multi-trophic systems may exhibit rhythms driven by the circadian clock of one of the members (which may also be influenced or reset by external factors).
A circadian rhythm (/ s ər ˈ k eɪ d i ə n /), or circadian cycle, is a natural oscillation that repeats roughly every 24 hours.Circadian rhythms can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment (is entrained by the environment).
Chopra says Rodgers was immediately “really trusting” with him and Hughes, adding that throughout their year working together on the documentary, Rodgers “was very open and vulnerable.”
Income Limits 2024. Income Limits 2025. Benefit Reductions. If you're under FRA. $22,320 per year. $23,400 per year. $1 for every $2 over the limit. If you'll reach your FRA this year
A cheeky little slice of cake here, a cookie there, or a nibble of chocolate every once in a while isn't the worst thing in the world. But according to new research, the buck stops at sugary drinks.