biological rhythms
internal cycle of biological activity
Biological rhythms refer to natural cycles and patterns that occur in living organisms. These rhythms occur on different scales, ranging from hours to years, and can be influenced by various internal and external factors.
One of the most well-known biological rhythms is the circadian rhythm, which is the 24-hour cycle that affects sleep-wake patterns, hormone levels, body temperature, and other physiological processes. The circadian rhythm is controlled by the suprachiasmatic nucleus (SCN) in the brain, which receives input from light-sensitive cells in the retina.
Another important biological rhythm is the menstrual cycle, which is controlled by hormones such as estrogen and progesterone. This cycle typically lasts around 28 days and involves the release of an egg from the ovary, thickening of the uterine lining, and eventual shedding of this lining if pregnancy does not occur.
Other examples of biological rhythms include the seasonal migration of birds, hibernation in animals, and the flowering of plants. These rhythms are often influenced by environmental cues such as changes in temperature and daylight hours.
Overall, biological rhythms are crucial for maintaining proper physiological functioning and adapting to changes in the environment. Disruptions to these rhythms, such as those caused by jet lag or shift work, can have negative effects on health and well-being.
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