Flashcards in Homeostasis Deck (21):
% of ECF is ISF?
% of ECF that is plasma?
What happens if capillary perfusion fails and plasma proteins enter the tissue?
What ratio of TBW is ECF?
What ratio of TBW is ICF?
Why do females have less TBW on average?
- Higher proportion of body fat
What % of muscle is water?
What percentage of fat is water?
The body's ability to maintain a constant internal environment
What is the process negative feedback control?
- 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
- Body "predicts" a change before it happens
- Initial change from reference leads to even greater disturbance
- Think like exponentials
What is the dilution principle?
What does the dilution principle allow you to calculate in the body?
Volume of distribution
What must be taken into account before using the dilution principle?
- Volume that has been excreted
What 3 water compartments can be measured DIRECTLY?
How do you measure plasma?
Attach radioactive labels to plasma proteins
Why is plasma volume able to be measured this way?
Plasma proteins can't move out of the plasma
What radioactive dye could you use?
What do you use to measure ECF?