Q:

Complete the sentence correctly. Parathyroid hormone

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Complete the sentence correctly. Parathyroid hormone:


  1. is produced by the parafollicular cells of the thyroid gland
  2. decreases the concentration of Ca ++ in the blood
  3. releases Ca ++ from the sarcoplasmic reticulum
  4. increases the concentration of Ca ++ in the blood.

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D: When the level of calcium in the blood is lower than required, PTH is released and causes the calcium concentration to increase. 

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