The biological clock tunes the organs of the body: timing by hormones and the autonomic nervous system.

@article{Buijs2003TheBC,
  title={The biological clock tunes the organs of the body: timing by hormones and the autonomic nervous system.},
  author={Ruud M. Buijs and Corbert G. van Eden and Valeri D Goncharuk and Andries Kalsbeek},
  journal={The Journal of endocrinology},
  year={2003},
  volume={177 1},
  pages={
          17-26
        }
}
The biological clock, the suprachiasmatic nucleus (SCN), is essential for our daily well-being. It prepares us for the upcoming period of activity by an anticipatory rise in heart rate, glucose and cortisol. At the same time the 'hormone of the darkness', melatonin, decreases. Thus, the time-of-day message penetrates into all tissues, interestingly not only by means of hormones but also by a direct neuronal influence of the SCN on the organs of the body. The axis between the SCN and the… Expand
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