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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.
That internal clock of the body does indeed exist and is called the suprachiasmatic nucleus. Our body is a very advanced system which has provision for all our needs. Through evolution, our bodies have developed a timetable for all our internal functions, based on the 24-hour cycle of day and night. The implementation and synchronization of the timetable, according to external stimuli, is controlled by the nucleus, which is a part of our brain.