Which is the principle cation in the plasma of the blood?
Correct answer: D. Sodium
- A. Potassium
- B. Magnesium
- C. Calcium
- D. Sodium
Explanation
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. Calcium, potassium and magnesium occur in small amounts.
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