Questions: A female with a recent history of broken bones, kidney stones, and fatigue comes. The physician finds that they have unusually high blood levels of calcium and immediately suspects that they are suffering from an excess of

A female with a recent history of broken bones, kidney stones, and fatigue comes. The physician finds that they have unusually high blood levels of calcium and immediately suspects that they are suffering from an excess of
Transcript text: A female with a recent history of broken bones, kidney stones, and fatigue comes. The physician finds that they have unusually high blood levels of calcium and immediately suspects that they are suffering from an excess of
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Solution

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The answer is the first one (or A): parathyroid hormone.

Explanation for each option:

A) Parathyroid hormone: This is the correct answer. Parathyroid hormone (PTH) is responsible for regulating calcium levels in the blood. An excess of PTH, a condition known as hyperparathyroidism, can lead to high blood calcium levels (hypercalcemia), which can cause symptoms such as broken bones (due to bone resorption), kidney stones (due to increased calcium excretion), and fatigue.

B) Calcitonin: This hormone lowers blood calcium levels by inhibiting bone resorption and increasing calcium excretion in the kidneys. An excess of calcitonin would not cause high blood calcium levels, so this option is incorrect.

C) Vitamin D: While vitamin D helps increase calcium absorption from the gut, an excess of vitamin D alone is less likely to cause the specific combination of symptoms described. However, it could contribute to hypercalcemia if taken in excessive amounts, but it is not the most direct cause in this scenario.

D) Thyroid hormone: Thyroid hormones primarily regulate metabolism and do not directly control calcium levels. An excess of thyroid hormone would not typically cause high blood calcium levels, so this option is incorrect.

In summary, the symptoms and high blood calcium levels are most consistent with an excess of parathyroid hormone.

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