Examlex
Who is most likely to get a cold?
Circadian Rhythm
An internal biological clock regulating a variety of physiological processes, including the sleep-wake cycle, over roughly a 24-hour period.
Diurnal
Periodically active during the day and inactive at night.
Ultradian
Describes biological rhythms with cycles shorter than 24 hours, such as the stages of sleep or patterns of hormone release.
Infradian
refers to biological rhythms with cycles that are longer than a day, such as menstrual or seasonal cycles.
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