42:CONCERNING BODY FLUIDS

[Editor]

a) approximately 60% of the male body weight is water
b) females have greater % total body water.
c) Two thirds of total body water is contained within the extra cellular space
d) Can be measured clinically
e) 10% of total body water is plasma

[Editor]

TFFTF

Approximately 60% of the adult male body weight is due to water. In woman this is slightly lower at 55%.In infants and neonates this can be as high as 70%.Two thirds of TBW is present within the intracellular space with 1/3 rd being in the extra cellular space. The various compartments can be measured clinically. The plasma volume represents 5% of the total body weight.

[patri]

measurement of body water:
TBW (60% of weight) ---- D2O
ECF (20% of weight) ---- Inulin
Plasma Vol (5% of weight) ---- Evan\'s blue
Red cell vol ---- radiolabelled chromium ,
albumin labelled with radio oiodine 51
ICF (40% of weight) indirctly
ISF (15% of weight) indirectly

[amijones]

plasma is 5 % of total body weight but Q asks what % of total body water - this would be approx 11 % so should E be true??