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Lecture 01: Body Fluids
Physiology 1510: Midwestern University
11
Physiology
Professional
09/11/2010

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Term
TBW = ??
Definition
ICF + ECF
Term
how much of TBW is ICF? ECF?
Definition
2/3
1/3
Term
how much of the ECF is interstitial fluid volume? Plasma volume?
Definition
3/4
1/4
Term
ECF = ??
Definition
ISF + plasma volume
Term
what is the major cation of ECF? ICF?
Definition
Na+, accompanied by Cl- and HCO3-
K+, accompanied by phosphates and anionic proteins
Term
What are the normal clinical ranges for intracellular cations? ECF?
Definition
Na= 15mM, K= 150mM
Na= 135-145mM or mEq/L, K=3.5-5.0mM or mEq/L
Term
number of particles per kg of water (mOsm/kg)
Definition
osmolality
Term
number of particles per liter of water (mOsm/L)
Definition
osmolarity
Term
the difference in osmolality
Definition
osmotic gradient
Term
osmolarity (mosm/L) =
Definition
2[Na+](mEq/L) + Glucose/18 (mg/dl) + BUN/2.8 (mg/dl)
Term
a measure of the drive for water movement
Definition
osmotic pressure
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