How Your Body Keeps Time
Whether you know it or not, you have an internal body clock that follows a daily 24-cycle known as a circadian rhythm. Our body clock, also known as a circadian clock, responds primarily to environmental cues, such as light and darkness, as well as genes that influence how quickly or slowly our body clock runs and, as a result, how closely it aligns with the 24-hour day.
Nearly every tissue and organ in the body is governed by its own circadian clock, which is responsible not only for controlling our sleep patterns, but for synchronizing every biological process — our temperature, our blood pressure, our hormones, to name just a few — to the time of day. A master clock, controlled by the brain, keeps all the clocks in sync./.../
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