A) Iodine is needed for thyroxine formation.
B) Calcium regulates the excitibility of nerve fibres.
C) Potassium plays an important role in the regulation of acid base balance in cell.
D) Phosphorus helps to maintain the osmotic pressure of the body fluids.
Correct Answer: D
Solution :
[d] Osmotic pressure of body fluids is mainly maintained by the plasma proteins (albumins, globulins) and electrolyte ions \[(N{{a}^{+}},{{K}^{+}}etc).\] Phosphorus has nothing to do with the osmotic pressure of body fluids.
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