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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.
The circadian system consists of a central 'biological master clock', which is located in the suprachiasmatic nucleus (SCN) of the hypothalamus, and peripherally located biological clocks, which are found in most tissues such as the heart and liver.This system has an endogenous rhythmicity of approximately 24 hours.he circadian system consists of a central 'biological master clock', which is located in the suprachiasmatic nucleus (SCN) of the hypothalamus, and peripherally located biological clocks, which are found in most tissues such as the heart and liver. This system has an endogenous rhythmicity of approximately 24 hours.