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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.
Biological Rhythms â A biological rhythm is any cyclic change in the level of a bodily chemical or function. â Biological rhythms can be: â Internal (endogenous) - controlled by the internal biological clock e.g. body temperature cycle â External (exogenous) - controlled by synchronizing internal cycles with external stimuli