Homeostasis
● Homeostasis- Maintaining a stable internal environment.
● The conditions inside your body need to be kept stable, even when the
external environment changes. This is really important because your cells
need the right conditions in order to function properly.
● Homeostasis is all about the regulation of the conditions inside your body
[and cells] to maintain a stable internal environment, in response to changes
in both internal and external conditions.
● You have a lot of automatic control systems in your body that regulate your
internal environment– these include both nervous and hormonal
communication systems.
● All your automatic control systems are made up of three main components
which work together to maintain a steady condition– cells are called
receptors, coordination centres and effectors.
● Your automatic control systems keep your internal environment stable using
a mechanism called negative feedback.
● When the level of something [e.g. water or glucose] gets too high or too low,
your body uses negative feedback to bring it back to normal
1. Receptor detects a stimulus– the level is too high.
2. The coordination centre receives and processes the information, then
organises a response.
3. Effector produces a response, which counteracts the change and restores
the optimum level– the level decreases.
1. Receptor detects a stimulus– the level is too low.
2. The coordination centre receives and processes the information, then
organises a response.
● Homeostasis- Maintaining a stable internal environment.
● The conditions inside your body need to be kept stable, even when the
external environment changes. This is really important because your cells
need the right conditions in order to function properly.
● Homeostasis is all about the regulation of the conditions inside your body
[and cells] to maintain a stable internal environment, in response to changes
in both internal and external conditions.
● You have a lot of automatic control systems in your body that regulate your
internal environment– these include both nervous and hormonal
communication systems.
● All your automatic control systems are made up of three main components
which work together to maintain a steady condition– cells are called
receptors, coordination centres and effectors.
● Your automatic control systems keep your internal environment stable using
a mechanism called negative feedback.
● When the level of something [e.g. water or glucose] gets too high or too low,
your body uses negative feedback to bring it back to normal
1. Receptor detects a stimulus– the level is too high.
2. The coordination centre receives and processes the information, then
organises a response.
3. Effector produces a response, which counteracts the change and restores
the optimum level– the level decreases.
1. Receptor detects a stimulus– the level is too low.
2. The coordination centre receives and processes the information, then
organises a response.
