-I'T able 1.1
Principal osm otic constituent s of plasma and intracellular fluid of some vertebrates
Pl asma mM / Kg wat er (or serum )
Intracellular mM Kg/H2O
(or mM/1 plasma)
N a
K
Cl
Mg Other
O smolar it y Na
K
Cl
Mg O ther
Osmol ar ity
Sea-wate
r
470
12 550 50
1070
Agnatha
My xin e glu tinosa'
549 11
563 19 No TM AO
1152
132 144 107 68 Amino acid
71 990
(H agfish)
TMAO
211
Lampetr a fluviatilis 2
120 3
96
4
270
(R iver lamprey)
Chondrichthyes
Ra ja clau ata"
289 4
311
Urea
444
1050
(Ray)
Pristis m icrod on t
170
Ure a
130
540
(Fresh wa ter saw fish)
Chim aera mo nt rosas
360
10 380
Ure a
265
(rabbi tfish)
Osteichthyes
Platichthy s ( Pleur onec tes ) flesus 6
(Flounder)
Sea-wat er
194 5 166
364
10 157 30
Amino acid 44 and TMAO
14
Fr esh water
157 5 114
304
15 158
42
Amino acid
71 and TM AO
30
Latim eria chalumnae l
181
199
29 Ur ea
355
1181
(Coelaca nrh)
Protopterus ae th iop icus t"
99
8
44
238
(African lun gfish)