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  4. Which is the principal cation in the plasma of the blood?

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Q. Which is the principal cation in the plasma of the blood?

AIPMTAIPMT 1999Body Fluids and Circulation

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.