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Understanding Biological Clocks: Free Running Period and Entrainment Explained

This article explores the concept of biological clocks, focusing on the length of one cycle of the rhythm known as the free running period. It explains how these rhythms operate under constant environmental conditions and how they can become entrained when aligned with external cues. The role of zeitgebers, or environmental cues that reset the endogenous clock, is discussed, along with the effects of phase shifts, where the timing of activity is altered. Understanding these concepts is essential for grasping the intricacies of circadian rhythms in living organisms.

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Understanding Biological Clocks: Free Running Period and Entrainment Explained

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Presentation Transcript

  1. Terms for biological clocks

  2. period • = LENGTH OF ONE CYCLE OF THE RHYTHM

  3. FREE RUNNING • RHYTHM SHOWN UNDER CONSTANT ENVIRONMENTAL CONDITIONS

  4. Free running period • free running = LENGTH OF ONE CYCLE OF THE RHYTHM UNDER CONSTANT ENVIRONMENTAL CONDITIONS

  5. ENTRAINED WHEN THE ENDOGENOUS RHYTHM IS IN SYNC WITH THE ENVIRONMENTAL CUES

  6. ZEITGEBER ENVIRONMENTAL CUE THAT RESETS THE ENDOGENOUS CLOCK

  7. Phase shift When the period of activity changes (either earlier of later)

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