The Chief Extracellular cation is sodium.
chloride
Sodium
potassium
potassium
Sodium
Sodium
calcium ; sodium
Sodium is the primary cation for ECF, potassium is the primary cation for ICF.
Sodium
Major Intracellular cation - K+ (Potassium) Major Extracellular cation - Na+ (Sodium) Major Intracellular anion - PO4+ (Phosphate) Major Extracellular anion - Cl- (Chloride)
Sodium ion is the most concentrated ion in the extracellular fluid.
chloride?
The barrier that separates the interstitial fluid from the intracellular fluid is the plasma membrane. The interstitial fluid is a major component of the extracellular fluid.
potassium
Perilymph is an extracellular fluid located within the cochlea (part of the ear) in 2 of its 3 compartments; the scala tympani and scala vestibuli. The ionic composition of perilymph is comparable to that of plasma and cerebrospinal fluid. The major cation of perilymph is sodium.