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The term "milieu intérieur" refers to the internal environment of the body, which is the fluid medium in which cells exist. This internal environment is crucial for survival and is maintained through a process called homeostasis. Homeostasis is a self-regulating mechanism that keeps biological systems stable by adjusting to conditions that are optimal for survival, even as continuous change occurs.12

A key example of homeostasis is the regulation of human body temperature, which aims to stay around 37°C (98.6°F). The hypothalamus in the brain plays a central role in this process, receiving feedback and initiating adjustments in breathing rate, blood sugar, and metabolism to maintain a stable internal temperature.32

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