Which one of the following statements is correct?

  • A
    $Mg$ plays roles in neuromuscular function and interneuronal transmission
  • B
    The daily requirement of $Mg$ and $Ca$ in the human body is estimated to be $0.2-0.3 \ g$
  • C
    All enzymes that utilise $ATP$ in phosphate transfer require $Ca$ as the cofactor
  • D
    The bone in human body is an inert and unchanging substance

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