What Is the Mechanism by Which the Parathyroid Glands Maintain

question 19

Multiple Choice

What is the mechanism by which the parathyroid glands maintain calcium homeostasis?

• A) They secrete parathyroid hormone (PTH), which promotes calcium storage in the intestines.
• B) They produce a hormone that, with calcitonin, takes calcium from the bones and promotes calcium absorption by the intestines.
• C) They stimulate the pituitary to produce PTH and calcitonin, which elevates serum calcium levels.
• D) They secrete hormones that stimulate the production of calcium in the bones and small intestines when serum calcium levels fall below 4.5 mg/dL.

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