This chapter explores the concept of circadian rhythms and the role of the suprachiasmatic nucleus (SCN) as the central master clock in the brain. It discusses how the SCN regulates various body functions, detects changes in the environment based on light intensity, and coordinates activities like sleep-wake cycles, body temperature regulation, and hunger. The chapter also emphasizes the relationship between the central clock in the brain and the peripheral clocks found in organs throughout the body.

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