Body rhythms and circadian · Physiology

The term 'zeitgeber' refers to:

  1. An endogenous, self-sustaining biological rhythm
  2. A sleep-promoting hormone released at night
  3. An external cue that synchronizes rhythms
  4. A core genetic clock protein oscillator
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Correct answer: An external cue that synchronizes rhythms

Zeitgebers are external environmental cues, such as light, that entrain circadian rhythms. They align internal clocks with the external world.

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