Which of the following occurs in maximum concentration in blood plasma (ECF)?
A
K+
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B
Mg+2
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C
Ca+2
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D
Na+
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Solution
The correct option is CNa+ Sodium constitutes around 90% of the positive ions in the extracellular fluid. Its concentration is maintained with the help of aldosterone hormone secreted by adrenal glands whose secretion stimulates distal tubules and collecting ducts to reabsorb sodium.