Final answer:
The term that describes the maintenance of internal stability within an organism, regardless of external changes, is regulatory homeostasis, primarily regulated through negative feedback.
Step-by-step explanation:
The term that describes a steady state in which the internal conditions of an organism are kept within a narrow range without regard to the external conditions is regulatory homeostasis. Homeostasis is the ability of the body to maintain a stable internal environment despite changing external conditions. It is maintained primarily through negative feedback, where a response to a stimulus helps keep a variable close to a set value, preventing excessive response. In contrast, positive feedback loops amplify the response until an endpoint is reached. Organisms regulate internal factors like body temperature, blood glucose, and water content to maintain homeostasis, through processes such as thermoregulation and osmoregulation.