Tetany is sustained contraction of muscle is due to

Parathyroid deficiency

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{C a}^{+ +}

deficiency

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Both A and B

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Autoimmune disease

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Solution

The correct option is C Both A and B
Parathormone of parathyroid gland reduces the blood phosphate level while increases the blood calcium level. Therefore, hyposecretion of parathyroid hormone decreases the blood calcium level due to its increased excretion in urine. It causes increased excitability of muscles and their sustained contraction referred to as parathyroid tetany. Thus, the correct answer is option C.

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