The cells in our body need specific conditions to function properly, even when the environment outside changes. The human body and its organs can only function if their internal conditions are kept within the desired range. The maintenance of a constant internal environment in the body is called homeostasis.
Homeostasis maintains optimal conditions for enzymes to work and for all cell functions to take place.
The control systems of the body are automatic and they can either involve nervous responses (the nervous system) or chemical responses (the endocrine system). Within our body, homeostasis helps to control many things, including:
These are all controlled by the body’s automatic control systems, which all include
The automatic control systems maintain the internal body environment using a method called negative feedback. When levels are too high or too low in the body, negative feedback helps to return the levels back to normal.
For example, when blood glucose levels are too low or high in the body, the body uses negative feedback to return them back to normal levels.
|When levels are too low||When levels are too high|
|The receptor detects the stimulus (low levels)||The receptor detects the stimulus (high levels)|
|The coordination centre receives and processes the information||The coordination centre receives and processes the information|
|The effector produces a response to increase the levels||The effector produces a response to decrease the levels|