Processes with 24-hour cycles are more generally called diurnal rhythms diurnal rhythms should not be called circadian rhythms unless they can be confirmed as endogenous, and not environmental.Īlthough circadian rhythms are endogenous, they are adjusted to the local environment by external cues called zeitgebers (German for "time givers"), which include light, temperature and redox cycles. The term circadian comes from the Latin circa, meaning "around" (or "approximately"), and diēm, meaning "day". These 24-hour rhythms are driven by a circadian clock, and they have been widely observed in animals, plants, fungi and cyanobacteria. Word of the Day: circadian rhythm (spelled out in the wavy circle-line across the grid) -Ī circadian rhythm ( / s ər ˈ k eɪ d i ə n/), or circadian cycle, is a natural, internal process that regulates the sleep–wake cycle and repeats roughly every 24 hours. It can refer to any process that originates within an organism (i.e., endogenous) and responds to the environment ( entrained by the environment). You also get the answer TWENTY-FOUR HOURS at the top of the grid ( 16A: Approximate length of 57-Across), as well as DAY up top ( 5A: Light time) and NIGHT down below ( 66A: Dark time) THEME: SLEEP-WAKE CYCLES (57A: Body's internal clock patterns, regulated by the phenomenon seen in the circled letters) - circled squares form a wave across the grid that spells out CIRCADIAN RHYTHM.
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