B4.008 - Prework 2 - Body Fluids and Electrolyte Disturbances Flashcards
how much of TBW is intracellular
2/3
how much of TBW is ECF and where is it
1/3 Plasma - 25% ISF - 75%
describe capillary pressure gradient
Capillary pressure declines from beginning to the end of the capillary
where is net filtration in the capillaries
first half
where is net reabsorption in the capillaries
second half
TBW =
60% of BW 72% of LBM
what is the most accurate method of determining TBW
72% of LBM because fat cells contain less water
normal osmolarity of ECF and ICF
290
what is an example of hypotonic expansion
excessive H20 intake
what is an example of hypotonic contraction
salt loss
what is an example of isotonic expansion
IV infusion of .9% saline
what is an example of isotonic contraction
hemorrhage
what is an example of hypertonic expansion
IV infusion of hypertonic saline
what is an example of hypertonic contraction
dehydration or sever sweating
what does giving .9% saline do
Isosmotic and isotonic fluid (ECF expands, ICF does not change)
what does giving dextrose 5% in water do
considered isosmotic but osmolatlity is a little less, so its a little hypotonic. given to increase ECF and ICF in someone with dehydration for example to prevent RBC lysis
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