The largest percentage of total body water in an adult is located in which fluid compartment?
intravascular
extracellular
intracellular
interstitial
The Correct Answer is C
A. intravascular: This compartment contains only about 5% of body fluid.
B. extracellular: Although significant, it accounts for only about one-third of total body water.
C. intracellular: The intracellular fluid compartment contains about two-thirds of the body’s water.
D. interstitial: Part of the extracellular fluid but only about 15% of total body water.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Skin: Some electrolytes are lost via sweat, but not the major route.
B. Lungs: Lungs excrete CO₂ but not most electrolytes.
C. Rectum: Some are excreted via feces, but the amount is minimal.
D. Kidney: The kidneys regulate and excrete electrolytes such as sodium, potassium, and calcium.
Correct Answer is C
Explanation
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.
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