1. Circadian Rhythm
The circadian rhythm is the pattern of fluctuations in bodily processes that occur regularly each day. Circadian rhythms are found in mostly all species. These rhythms are synchronized with the 24 hour cycle of day and night. In humans, the sleep-wake cycle operates on a circadian rhythm that is close to 24 hours in length. ... It follows a circadian rhythm in which the body's temperature falls a few degrees during the middle of the night, rises early in the morning, and then peaks by mid-day. ...
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- Grade Level: High School