Homeostatis Flashcards
1
Q
What does the internal environment refer to?
A
The fluid surrounding cells - extracellular or interstitial fluid.
2
Q
What is homeostasis?
A
The ability of the body to maintain a condition of dynamic equilibrium within the internal environment when dealing with external changes.
3
Q
Give examples of controlled variables
A
- conc of ions, nutrients & blood gases
- physical characteristics of blood
4
Q
Describe the homeostatic mechanism
A
Stimulus
↓
sensors
(afferent pathway) ↓
integration at control centre
(efferent pathway) ↓
effectors
↓
response
5
Q
What is feed-forward regulation?
A
Anticipating a change - same mechanism as homeostatic
