Which element is most abundant outside animal cell?
A
Na
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B
K
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C
I2
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D
Fe
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Solution
The correct option is A Na Living systems in general maintain a high intracellular concentration of potassium and low intracellular concentration of sodium. Living systems operate sodium potassium pump for this purpose which actively throws out sodium from the cytoplasm and transports potassium ions from extracellular environment to inside the cytoplasm.