Homeostasis Flashcards
1
Q
% of ECF is ISF?
A
80%
2
Q
% of ECF that is plasma?
A
20%
3
Q
What happens if capillary perfusion fails and plasma proteins enter the tissue?
A
Gangrene
4
Q
What ratio of TBW is ECF?
A
1/3
5
Q
What ratio of TBW is ICF?
A
2/3
6
Q
Why do females have less TBW on average?
A
- Higher proportion of body fat
7
Q
What % of muscle is water?
A
70%
8
Q
What percentage of fat is water?
A
10%
9
Q
Define homeostasis?
A
The body’s ability to maintain a constant internal environment
10
Q
What is the process negative feedback control?
A
- Change detected as a stimulus by a receptor
- Information sent to an integrating centre
- Integrating centre compares the stimulus to a reference level
- Magnitude of difference sent to an effector as an ERROR signal
- Effector responds equally opposite to fix
11
Q
Feedforward control?
A
- Body “predicts” a change before it happens
- Pre-emptive
12
Q
Positive feedback?
A
- Initial change from reference leads to even greater disturbance
- Think like exponentials
13
Q
What is the dilution principle?
A
c=m/v
14
Q
What does the dilution principle allow you to calculate in the body?
A
Volume of distribution
15
Q
What must be taken into account before using the dilution principle?
A
- Volume that has been excreted
