5. ECF Volume Regulation Flashcards
1
Q
what determines the total body water between cells and ECF
A
determined by the number of cosmically active particles in each compartment
ie regulation of body Na+
2
Q
why is it the number of osmotically active particles that determines TBW in the ECF
A
H2O can freely cross all cell membranes therefore the body fluids are in osmotic equilibrium - need osmotic particles to move water
3
Q
what are the major ECF osmoles
A
Na+ and Cl-
4
Q
what is the major ICF osmole
A
K+ salts
5
Q
what 2 parts comprise the ECF
A
plasma and interstitial fluid
