Biological cycles repeating roughly every 24 hours are known as what?

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Multiple Choice

Biological cycles repeating roughly every 24 hours are known as what?

Biological cycles repeating roughly every 24 hours are circadian rhythms. These come from an internal clock in the brain, primarily the suprachiasmatic nucleus, and they’re tuned to the day-night cycle. They help regulate when we feel awake, when our body temperature rises or falls, and when hormones are released, so our daily activities align with daylight. While the rhythm is generated internally, it can be adjusted by external cues like light, meals, and social patterns. Ultradian rhythms are shorter than a day (for example, sleep stages about every 90 minutes), infradian rhythms are longer than a day (such as the menstrual cycle), and “daily cycles” is a descriptive phrase but not the standard scientific term for a ~24-hour pattern. Circadian rhythms is the precise term for these ~24-hour cycles.

Biological cycles repeating roughly every 24 hours are circadian rhythms. These come from an internal clock in the brain, primarily the suprachiasmatic nucleus, and they’re tuned to the day-night cycle. They help regulate when we feel awake, when our body temperature rises or falls, and when hormones are released, so our daily activities align with daylight. While the rhythm is generated internally, it can be adjusted by external cues like light, meals, and social patterns.

Ultradian rhythms are shorter than a day (for example, sleep stages about every 90 minutes), infradian rhythms are longer than a day (such as the menstrual cycle), and “daily cycles” is a descriptive phrase but not the standard scientific term for a ~24-hour pattern. Circadian rhythms is the precise term for these ~24-hour cycles.

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