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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.
In humans and animals, circadian patterns follow a 24-hour cycle which is directed by the circadian control center of the brain, called the suprachiasmatic nucleus (SCN), located in the hypothalamus. The rising and setting of the sun is literally hardwired into our neurobiology.