Practice Quiz

Registered Dietitian

Category - Nutrition Care

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Blood calcium levels are regulated by which of the following mechanisms? (Choose all that apply.)
  1. Decreased serum calcium stimulates the release of parathyroid hormone (PTH) from the parathyroid glands.
  2. PTH stimulates the deposit of calcium into the bones and calcium reabsorption from the renal distal tubules.
  3. Increased serum calcium levels stimulate the release of calcitonin from the thyroid gland
  4. None of the above
Explanation
Answers: A and C - Blood calcium levels are regulated by a feedback loop involving the hormones PTH and calcitonin. Low blood calcium levels trigger the response of PTH, which causes resorption of calcium from bone, as well as calcium reabsorption from the renal distal tubules. Increased levels of blood calcium stimulate the release of calcitonin, which acts to move calcium out of the blood and into the bone.
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