The blood calcium level is lowered by the deficiency of

  1. A) calcitonin
  2. B) both calcitonin and parathormone
  3. C) thyroxine
  4. D) parathormone

Answer:D) parathormone

Explanation: Parathormone is a peptide hormone secreted by the parathyroid glands. It is a hypercalcemic hormone. It increases the calcium level in blood by promoting demineralisation of bones, reabsorption of calcium from the renal tubules and absorption in the intestine. Thus, deficiency of parathormone (PTH) leads to lower blood calcium level.

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