Question
Biology Question on body fluids and circulation
Which is the principal cation in the plasma of the blood?
A
potassium
B
magnesium
C
calcium
D
sodium.
Answer
sodium.
Explanation
Solution
Blood consists of a watery fluid called plasma. Plasma is a faint yellow, slightly alkaline, viscous fluid. It consists of 90% water, 1% inorganic salts, 7% or 8% proteins and 1% of other substances. The inorganic salts in plasma occur as ions. Sodium is the main cation of plasma and chloride, the main anion. Potassium, calcium and magnesium occur in small amount.