The term for biological systems maintaining a stable internal environment is homeostasis. This process involves various physiological mechanisms that regulate factors such as temperature, pH, and electrolyte balance within an organism. Homeostasis is crucial for optimal cellular function and survival by enabling organisms to adapt to changing external conditions. Failure to maintain homeostasis can lead to dysfunction, diseases, or even death. Mechanisms include feedback loops, hormonal responses, and neural signaling, illustrating the interconnectedness of biological systems.