Which electrolyte has the greatest influence on water balance in the body:
chloride
potassium
sodium
calcium
The Correct Answer is C
A. chloride: Chloride follows sodium and helps maintain osmotic pressure but is not the primary driver.
B. potassium: Potassium is the major intracellular cation and influences cell function, not extracellular water balance.
C. sodium: Sodium is the main extracellular cation and key in regulating osmotic pressure and fluid balance.
D. calcium: Calcium is important for muscle contraction and bone health but not for water balance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Calcium: Important for neuromuscular function but not fluid balance.
B. Sodium: Sodium is the main extracellular cation and is vital in controlling extracellular fluid volume.
C. Potassium: Potassium is the main intracellular cation.
D. Bicarbonate: It's an important buffer but not the main determinant of fluid volume.
Correct Answer is B
Explanation
A. 2.2 kg: 2.2 kg is equivalent to approximately 5 lbs and overestimates the weight of 1 L of fluid.
B. 1.0 kg: 1 liter of fluid = 1 kilogram (kg). This is used to track fluid gain/loss accurately.
C. 0.5 kg: 0.5 kg would be equivalent to 500 mL, not 1 L.
D. 0.22 kg: 0.22 kg is far below the actual weight of 1 L of fluid.
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