Homeostasis Flashcards
1
Q
Homeostasis definiton
A
Mechanisms by which conditions of the tissue fluid is kept at a relatively constant level
2
Q
Feedback
A
When effectors respond to the co-ordination centre and bring about a response that then changes the input
3
Q
Negative feedback
A
Achieves homeostasis
Change in the level of an internal factor causes effectors to restore it to its original level
4
Q
Example of negative feedback
A
Increase in body temp
Sweat and vasodilation
Heat lost from blood
Normal temp restored
5
Q
Positive feedback
A
Not common
Increases original change detected by receptors
6
Q
pH
A
Too high or too low — enzymes become denatured
Ionic and H bonds break
Shape of active site changes
No enzyme-substrate complexes
pH = -log10 [H+]
