If the physiologic change in an organism is induced in an experimental condition, the process is then called acclimation . Many physiological activities are directly involved with the process of maintaining homeostasis . Animals may have different homeostatic responses to different environmental changes . For any particular homeostatic response an animal may be a conformer or a regulator . Often survival is determined by the cellular tolerance to these changes.
Regulators use physiologic mechanism to regulate their internal environment to the external changes.
However, regulators have a limit in their regulatory ability and this zone of stability may be broad or narrow, depending on the organism. This requires a sensory system to gather the necessary information and relay it back to a controller. Feedback can be either negative or positive . A negative feedback system requires an inverter that reverses the sensory detection to up or down regulate . In other words if the sensory system detects a fall in temperature then the body heating system is up regulated, while a rise in body temperature past the set point would turn-off the heating mechanism.