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Question
Which of the following is not true about extracellular fluids?
Options:
A .  The extracellular fluid has a very low concentration of sodium.
B .  Extracellular fluid is the fluid present outside the cells.
C .  Chemical compositions of plasma and Interstitial fluids are similar
D .  The concentration of calcium is high in this fluid which is useful for muscle contraction.
Answer: Option A
:
A
Extracellular fluid differs from intracellular fluid (fluid within the cells) in that it generally has a high concentration of sodium and low concentration of potassium, while intracellular fluid is high in potassium and low in sodium.

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