True statements about ions composition in body:
a. Intracellular & Extracellular ions compositions are same b. Phosphorus and Mg are major ions intracellularly c. Na, Cl principal ions in E.C.F. d. Kidney tightly regulates Nat K, C1 composition.
e. Ca is major ion intracellularly
Ans:
(B) Phosphorus and Mg are major ion intracellularly ; (C) Na, Cl principal ions
E.C.F. (D) Kidney tightly regulates Nat K, C1 composition.
• ECF contains large amounts of Na and Cl and reasonably
large amounts of HCO3, but only small quantities of K, Ca2, Mg2, P042 and
organic acid ions.
• The composition of ECF is carefully regulated by various
mechanisms but especially by kidneys. This allows cells to remain continually
bathed in a fluid that contains the proper concentration of electrolytes and
nutrients for optimal cell function.
• ICF contains large amount of K and P042 plus moderate
quantities of Mg2 and sulfation, but only small quantities of Na and CF and
almost no Ca2.
