The suprachiasmatic nucleus is the internal master biological clock that governs the timing of circadian rhythms.

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The suprachiasmatic nucleus (SCN) is located in the hypothalamus and serves as the internal master biological clock that regulates circadian rhythms. It receives information about light and dark cycles from the eyes and synchronizes the body's internal clock with the external environment.

The Suprachiasmatic Nucleus Is the Internal Master Biological Clock That