Final answer:
In a negative feedback system, the correct response when a value deviates from the normal range is that the system acts to maintain or restore it to the normal range, thus maintaining homeostasis.
Step-by-step explanation:
In a negative feedback system, when the value starts to deviate from the normal range, the system maintains or restores the value to the normal range. This stabilization process is crucial for maintaining homeostasis, which is the body's way of keeping its internal environment stable and consistent, despite changes in the external environment. In biology, this can be seen with body temperature regulation; when the body's temperature strays from the norm, physiological processes are activated to bring it back to an optimal level.
A negative feedback system typically has three main components: a sensor (or receptor), a control center, and an effector. The sensor monitors physiological values and reports them to the control center, which then compares the values to a normal range. If there is a deviation, the control center activates an effector, which works to correct the situation and return the value to the normal range. An example of this process in action is when body temperature rises, the body perspires to cool down, bringing the temperature back to a set point.