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The blood calcium level is lowered by the deficiency of

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Thyroxine

Calcitonin

Parathormone

Melatonin

answer is C.

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Detailed Solution

Concept: Parathormone regulates blood calcium along with thyrocalcitonin.

Parathormone increases blood calcium levels, whereas thyrocalcitonin decreases blood calcium levels. Therefore, the blood calcium levels decrease either by hypersecretion of thyrocalcitonin or hypo secretion of parathormone.

Hence, the correct answer is option C.

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