Flexi Says: Homeostasis is normally maintained in the human body by an extremely complex balancing act. Regardless of the variable being kept within its normal range, maintaining homeostasis requires at least four interacting components: stimulus, sensor, control center, and effector.
The stimulus is provided by the variable being regulated. Generally, the stimulus indicates that the value of the variable has moved away from the set point or has left the normal range.
The sensor monitors the values of the variable and sends data on it to the control center.
The control center matches the data with normal values. If the value is not at the set point or is outside the normal range, the control center sends a signal to the effector.
The effector is an organ, gland, muscle, or other structure that acts on the signal from the control center to move the variable back toward the set point.