Table
1.1
Principal osmotic constituents
0/ plasma and in tracellular fluid
0/ some ve rtebrates
Plasma mM /Kg wa te r (or ser um)
I ntracell ul a r mM Kg /H2O
(or mMiI plasma)
Na
K
C l
M g Other
Osmolarity Na
K
Cl
Mg O th er
Osmolarity
A mphibia
Bu]o viridis 8
113
5
99
Urea 16
279
30
95
17
Amino acid 100
(European gr een toad)
U rea 17
Rana can criuora r
252 14
227
Urea 350
830
(Crab -ea ti ng fr og) (in 80% sea-w ater)
R e
ptilia
Trachy saurus rugosus'"
168
5
50 125
(Bobtai l liza rd )
Aves
Larus
glaucescens' v
154
4
(Gull)
Mammalia
150
6
119 16
Urea 7
324
16 152
5 16
Amino acid 3
350
Rat' 2
Amino acid 30
Urea 7
R
eferences : IBELLAMY and
CHESTER JONES (196 1); 2R o BERTSON
(195 4) ;
3MuRRAY and
POTTS (196 1); 4H. SMITH (1936) ; 5FANG E a nd F UGELLI (1962) ; 6LANGE a nd FUGELLI (1965);
7P ICKFOR D and GRANT (1967); 8G ORDON (1965); °G ORDON
et al. (1961); IOBENTLEY (1959a);
lJl
11Ho LMES, BUTLER a n d PHILLIPS (1961); 12HARRIS (1960); I3SMITH (1930 a ).