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The blood calcium level is lowered by the deficiency of:

1. parathormone
2. thyroxine
3. both calcitonin and parathormone
4. calcitonin

Correct answer: parathormone

Solution

Parathormone (PTH) increases blood calcium by promoting calcium release from bone, reabsorption in the kidneys, and activation of vitamin D. A deficiency of PTH therefore lowers blood calcium levels.

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