3 Types Of Biological Rhythms
- Circadian Rhythms: biological cycles that occur about every twenty-four hours. Sleep follows a circadian rhythm. Hormone secretion, blood pressure, body temperature, and urine production also have circadian rhythms.
- Infradian Rhythms: biological cycles that take longer than twenty-four hours. For example, women’s menstrual cycles occur about every twenty-eight days.
- Ultradian Rhythms: biological cycles that occur more than once a day. Sleep follows an ultradian rhythm of about ninety minutes as well as a circadian rhythm. Alertness and hormone levels also follow ultradian rhythms.
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