The human biological clock influences alertness, hunger, metabolism, fertility, mood and other physiological conditions. They follow a certain type of feedback loop in which the clock genes contain instructions for making clock proteins, whose levels rise and fall in a regular cyclic pattern. This pattern in turn regulates the activity of the genes. This biological clock drives our circadian rhythms. These circadian rhythms are physical, mental and behavioral changes that follow a roughly 24-hour cycle, responding primarily to light and darkness in our environment. The biological clock might get thrown off by changes in light or temperature but it usually resets itself in a couple of days. This is why we take a couple of days to adjust to a place that is half way across the globe to our usual residence. They work day and night and is incredibly intricate. Humans also have a master clock that consists of well over 20,000 nerve cells located in the hypothalamus.
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