A 40 year old woman develops spontaneous muscle contractions shortly after thyroidectomy. Her blood parathyroid hormone and calcium are low. What is the most likely action of parathyroid hormone to increase blood calcium level?

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indirect increase of calcium renal proximal tubular reabsorption

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direct inhibition of calcitriol formation

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direct stimulation of calcium absorption from the intestines

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direct promotion of bone matrix and collagen resorption

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inhibition of phosphate reabsorption from the kidney distal tubules

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A 40 year old woman develops spontaneous muscle contractions shortly after thyro...

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