What term refers to the state of "body in balance"?

The term that refers to the state of "body in balance" is homeostasis. Homeostasis is a physiological process by which various systems maintain stability while adjusting to conditions that are optimal for survival. It ensures that the internal environment of the body remains constant despite external changes, thereby supporting overall health and function. This includes the regulation of temperature, pH levels, hydration, and other critical factors.

While other terms like equilibrium, health, and stability are related concepts, they do not capture the specific interplay of bodily systems working to maintain a balanced internal state in the way that homeostasis does. Equilibrium can refer more broadly to a state of balance without necessarily implying the active processes of maintaining that balance. Health encompasses a broader spectrum of wellbeing, while stability may refer to consistent or unchanging conditions that do not necessarily reflect the dynamic process of balance seen in homeostasis.