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Parathormone deficiency produces muscle ramps or tetany as a result of

1. lowered blood Ca++
2. enhanced blood Na+
3. enhanced blood glucose
4. enhanced blood Ca++

Correct answer: lowered blood Ca++

Solution

Parathormone (PTH) raises blood calcium by promoting calcium release and reabsorption. If PTH is deficient, blood Ca++ drops, which increases neuromuscular excitability and can cause muscle cramps or tetany.

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