Question

Which one of the following components of urine in a healthy human does not differ much in concentration from that of blood plasma ?

• A. $N{H}_4^{+}$
• B. $K^{+}$
• C. $N{a}^{+}$
• D. $S{O}_4^{2-}$

Answer 1

The correct option is C $N{a}^{+}$

K${}^{+}$ is an intracellular ion and is less extracellular. So it is present less in blood plasma than that excreted in urine.

NH${}_4$${}^{+}$ ions are toxic in their state and always found in the bound form. So it is less in blood plasma. More amounts of nitrogenous wastes are excreted in urine.

SO${}_4$${}^{-}$${}^2$ in the body is present mostly in amino acids. They are released into urine mostly during diseased conditions. So they are present in minute amounts in the urine than blood plasma.

Na${}^{+}$ is an extracellular ion. Its occurrence depends mostly on water. So it's levels are similar almost in both plasma and urine.

So, the correct option is C.