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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.
Light is not just for vision. It is well known that humans have a biological clock located in the suprachiasmatic nuclei that generates and regulates circadian rhythms. Biological rhythms that repeat approximately every 24 hours are called circadian rhythms.