What is the significance of sodium $(Na^+)$ and potassium $(K^+)$ ions in biological systems?

  • A
    They maintain the osmotic pressure of extracellular fluid.
  • B
    They are essential for water regulation.
  • C
    They maintain ionic balance.
  • D
    They maintain the osmotic pressure of intracellular fluids.

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$R$: These antigens are of three types and are found in the oligosaccharide-rich head regions of a glycophorin.

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