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THE SUPRACHIASMATIC NUCLEI AND THE PINEAL GLAND. Most human bodily functions and behaviours are not âsteady-stateâ. Instead, they fluctuate in 24-hour cycles, such as the sleeping and waking cycle and the cycles for body temperature, hunger, and the secretion of various hormones.
We all have a built-in body clock. Itâs a small group of cells made up of unique âbody clockâ genes, called the suprachiasmatic nucleus, or SCN. These cells turn on and off and tell other parts of the body what time it is and what to do. The body clock keeps us in tune with the pattern of day and night.