Introduction to homeostasis Flashcards
1
Q
Does homeostasis mean that there can not be any variation?
A
-No:
Variations happen and are dynamically and actively regulated to minimise disturbance to the internal environment
2
Q
What is necessary for homeostasis to be maintained?
A
3
Q
What is negative feedback?
A
-Physiological homeostasis mechanisms which are initiated to ultimately oppose the change that triggered it
>amplitude of change depends on amplitude of error signal
4
Q
Describe the negative feedback loop.
A
5
Q
Describe the negative feedback loop of ↓ Arterial pO2 in plasma.
A
6
Q
What arises from the bodies attempts at maintaining homeostasis?
A
- Many signs and symptoms
- Understanding of different homeostatic regulatory systems will help with differential diagnosis
7
Q
What is positive feedback?
A
-amplify the initial change
e.g Oxytocin-induced cervical contraction during labour
