What Is the Mechanism by Which the Parathyroid Glands Maintain

question 1

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.