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THE FREE SPEECH ADVOCATE WHAT ARE INTERNAL BIOLOGICAL NODES? Internal biological nodes, frequently referred to as the master clock or internal biological clocks, are specialized clusters of cells in the brain that function as the body's timekeeping system, regulating daily cycles of activity known as circadian rhythms. These nodes ensure that physiological processes—such as sleep-wake cycles, hormone release, and appetite—align with the 24-hour day/night cycle. https://www.facebook.com/share/v/1GUuYR2fZC/