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 body’s control systems are automatic and can involve either nervous responses (the nervous system) or chemical responses (the endocrine system). Within our body, homeostasis helps to control many things, including:
These are all regulated by the body’s automatic control systems, which include
The automatic control systems maintain the internal body environment through a mechanism known as negative feedback. When levels are too high or too low in the body, negative feedback helps to restore equilibrium.
For example, if blood glucose levels in the body are too low or too high, negative feedback mechanisms work to bring them back to normal.
|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|