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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.
This nucleus is essentially the planning commission in the brain, which plans the sleep cycle, the hunger cycle, and the hormone release cycle of the body. Still, the main biological clock is the nucleus, also known as the pacemaker of the circadian cycle.