While discussing the role of parathyroid glands in bone formation, the instructor will mention which of the following statements? To maintain adequate serum calcium levels, parathyroid hormone: Select all that apply
A) Activates vitamin D to increase intestinal absorption of calcium
B) Reduces serum phosphate levels
C) Facilitates release of calcium from the bone
D) Stimulates the kidneys to hold on to more sodium
E) Reduces tubular reabsorption of phosphates
Ans: A, B, C
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Parathyroid hormone (PTH) maintains serum calcium levels by initiation of calcium release from bone, by conservation of calcium by the kidney, by enhanced intestinal absorption of calcium through activation of vitamin D, and by reduction of serum phosphate levels. Calcium is immediately released from the canaliculi and bone cells; a more prolonged release of calcium and phosphate is mediated by increased osteoclast activity.
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What does it NOT do?
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Answer the following statement true (T) or false (F)