In teaching a client with hypoparathyroidism about the disorder, which statement by the nurse best explains how the parathyroid hormone controls calcium levels in the blood?
1. "Parathyroid hormones promote magnesium excretion by the kidneys, which raise blood calcium levels."
2. "Parathyroid hormones stimulate cells of the gastrointestinal tract to absorb dietary calcium, raising the blood level."
3. "Parathyroid hormone blocks phosphorous excretion by the kidneys, which then decreases the blood calcium level."
4. "When blood calcium levels fall, parathyroid hormones stimulate bone resorption and increase calcium in the blood."
Answer: 2
1. Parathyroid hormone does not regulate magnesium levels.
2. Parathyroid hormone stimulates calcium reabsorption from the kidneys and intestines.
3. Parathyroid hormone stimulates calcium reabsorption from the kidneys.
4. Parathyroid hormone is excreted by the parathyroid glands and regulates serum calcium and phosphorous levels; in response to low serum calcium, it stimulates resorption of calcium from the bones.
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