Final answer:
The optimal value for a system variable in homeostasis is called the set point, which is what the body attempts to maintain through negative feedback mechanisms.
Step-by-step explanation:
The optimal value of the system variable in a homeostatic system is termed the set point. Homeostasis aims to maintain equilibrium around this set point, which is the standard our bodies strive to return to after any changes.
For instance, if body temperature or blood glucose levels deviate from their set points, homeostatic mechanisms will trigger a response to bring these values back to their normal range.
This process involves four main components: the stimulus that causes a deviation, the sensor that detects the change, the control center which processes the information, and the effector which executes the necessary response to reestablish balance.