Class notes
Body fluid compartments
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Lecture notes of 6 pages for the course Medicine at QUB (Physiology)
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BODY FLUID COMPARTMENT1 B W is split into two
compar ments
Intracellular fluid ICF
2 3 of T B W
Inside of all cells
Extracellular fluid
I 13 of T B W
Surrounds all cells
Further divided into plasma interstitial fluid
T B W depends on age gender
It constitutes
and
body fat
so of bodyweight in women
and 60 in men
Due to difference in f at
content C men have more lean mass than women
To calculate weight of each bodycompartmentC701cgM
the
T BW I 60 x
70kg 42 L
l CF 213 of 42 L 28L
E CF I 13 of 42 L I I 4 L C further divided into
, Interstitial fluid314 of C CF 10 SL
plasma 114 of C CF 3 SL t
Tran cellular fluid O SL Found in compartments
such as joints CSF
The two main body fluid compartments have different
electrolyte compositions
Phosphate and potassium are
the major components of ICF
Sodium chloride are major
components of ECF
Measurement of body fluid compartments
Indicator C
dye dilution methods
Amount of indicator Cx known
Known volume of fluid V
Final concentration c i calculated
V Xtc
Indicator properties
Even distribution
No leak
Non toxic
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