Which of the following are electrolytes? 1. Partial pressure of oxygen at 50% saturation (P50) 2. Na+ 3. Ca++ 4. HHb 5. HCO3–
a. 2 and 3 c. 2, 3, and 5
b. 1, 3, and 4 d. 2, 3, 4, and 5
ANS: A
Sodium and calcium are electrolytes. P50 is the partial pressure of oxygen at 50% saturation. HHb is deoxygenated hemoglobin, and HCO3– is bicarbonate.
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