A) iodine is needed for thyroxine formation
B) calcium regulates the excitibility of nerve fibres ag
C) potassium plays an important role in the regulation of acid-base balance in cell
D) phosphorous helps to maintain the osmotic pressure of the body fluids.
Correct Answer: D
Solution :
: Osmotic pressure of the body fluids is maintained by sodium, glucose and urea. Phosphorous is needed for vitamin D metabolism.
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