Q:

How do calcitonin or parathyroid hormone control blood calcium levels

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How do calcitonin or parathyroid hormone control blood calcium levels?


  1. Calcitonin acts to increase blood calcium levels
  2. Parathyroid hormone release is inhibited by increased calcium levels
  3. Parathyroid hormone stimulates bone resorbing cells to take up calcium
  4. Calcitonin inhibits parathyroid hormone

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B: PTH acts to increase blood calcium levels. Hence less is required when blood calcium level is high.  

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