What name is given to the rhythmic biologic clock that exists in humans?
A) Sleep-wake cycle
B) Alert-unaware process
C) Circadian rhythm
D) Yo-yo theory
Ans: C
Rhythmic biologic clocks are known to exist in plants, animals, and humans. Circadian rhythms complete a full cycle every 24 hours and in humans affect heart rate, blood pressure, body temperature, hormone secretions, and metabolism, as well as performance and mood.
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