How the parathyroid hormone increases the $Ca^+$ levels in the body.

  • A

    Acts on bones and stimulates the process of boneresorption.

  • B

    Stimulates reabsorption of $Ca^{++}$ by the renal tubules.

  • C

    Increases $Ca^{+2}$ absorption from the digested food.

  • D

    all of above.

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