Which concept refers to the maintenance of stable internal conditions within specific limits?

Homeostasis is the concept that refers to the maintenance of stable internal conditions within specific limits. This involves a series of physiological processes that help regulate variables such as temperature, pH, and electrolyte balance to ensure that the body's internal environment remains constant despite changes in external conditions.

For instance, when a person's body temperature rises due to external heat, mechanisms such as sweating and increased blood flow to the skin work to lower the temperature, returning it to a safe, stable level. Homeostasis is crucial for the body's overall functionality and survival, as it allows the body to operate optimally in a changing environment.

The other concepts, while related to physiology, do not accurately describe this process. Neurophysiology deals specifically with the physiology of the nervous system. Feedback refers to processes that can involve homeostasis but does not alone encompass the entire concept. Adaptability refers to the ability to adjust to new conditions, which is more about change over time rather than the active maintenance of internal stability.