Human Performancehard#979
The human body clock naturally runs on a cycle of approximately:
A
exactly 24 hours
B
28 hours
C
22 hours
D
slightly more than 24 hours (about 24.5-25 hours)
CorrectExplanation
The free-running circadian clock has a period slightly longer than 24 hours, which is why westbound travel (lengthening the day) is easier to adapt to.
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