Biological patterns repeating in 24-hour cycles.

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Multiple Choice

Biological patterns repeating in 24-hour cycles.

Biological patterns that repeat roughly every 24 hours are circadian rhythms. They arise from the body's internal clock in the brain, particularly the suprachiasmatic nucleus, and are synchronized by the light-dark cycle outside. This timing guides daily processes like sleep-wake cycles, body temperature, and hormone release (for example, melatonin and cortisol), helping the body anticipate and adapt to day and night. Ultradian rhythms are shorter than a day, such as the ~90-minute cycles of sleep stages. Infradian rhythms are longer than a day, like the roughly monthly menstrual cycle. The term “biologic rhythms” is too broad and doesn’t specify a 24-hour period.

Biological patterns that repeat roughly every 24 hours are circadian rhythms. They arise from the body's internal clock in the brain, particularly the suprachiasmatic nucleus, and are synchronized by the light-dark cycle outside. This timing guides daily processes like sleep-wake cycles, body temperature, and hormone release (for example, melatonin and cortisol), helping the body anticipate and adapt to day and night.

Ultradian rhythms are shorter than a day, such as the ~90-minute cycles of sleep stages. Infradian rhythms are longer than a day, like the roughly monthly menstrual cycle. The term “biologic rhythms” is too broad and doesn’t specify a 24-hour period.

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