Concentration of sodium in ECF is: (A) 130-136 millimoles/lit, (B) 132-140 millimoles/lit, (C) 138-146 millimoles/lit, (D) 140-147 millimoles/lit
Answer is C. Sodium levels are usually between 136to 145 mmol/L . Blood sodium level less than 136mmol/L mean you have less sodium Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 50