Homeostasis And Negative Feedback Flashcards
What is homeostasis?
It is the maintenance of a constant internal environment despite external changes.
What is negative feedback?
It is a process that brings about a reversal of any change in conditions.
It ensures that an optimum steady state is maintained as the internal environment is returned to its original set of conditions after any change.
What is Positive Feedback?
A process that increases any change detected by the receptors. It tends to be harmful and does NOT lead to homeostasis.
How can enzymes be affected by changes in temperature
SYNOPTIC LINK
A rise in temperature makes molecules vibrate more.
If a temperature is too high above the optimum, bonds are broken in the tertiary structure (Ionic & Hydrogen).
The active site changes shape so substrate can no longer fit in (less enzyme-substrate complexes formed).
The enzyme is denatured.
What are the principles of homeostasis?
- any change is detected by receptors
- the communication system transmits a message from the receptor to the effector
- through negative feedback the effectors reverse the change
