Biorhythm - The internal clock
The man is like almost all living biological rhythms and cycles that occur over the development as a vital highlighted. The links will be followed by a relatively young scientific discipline that explores chronobiology.
Particularly well known is the day-night rhythm of working and resting phases and prehistory regulates closely with the distribution of light throughout the day together. The same goes for summer and winter time, the human body by different lengths of solar radiation influence - long periods in winter and minimize the energy secured before the survival of ancient times.
That's why we thought earlier, that the organism from the outside at a predetermined frequency response. We now know, however, that we have a separate clock, internal clock. Although it responds to external influences, but even then is ticking, if environmental factors such as the light turned off. Is controlled by processes such as the distribution of the hormone melatonin.
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