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Module 9. Human factors

Circadian Rhythms have a cycle of

  • 25 Hours.
  • 24 Hours.
  • 23 Hours.

Explanation

Left to run free without daylight and other time cues, the body's internal clock settles to a natural period of about 25 hours, which is why the rhythm has to be reset daily to the 24-hour day. The 24-hour figure is the entrained cycle, not the free-running circadian period taught here.

Sangareddy Patil asking:

the answer should be 24 hours

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