A 70-year-old female has brittle bones secondary to osteoporosis. Her primary care provider pre-scribes calcitonin to:
a. activate vitamin D.
b. stimulate osteoclastic activity.
c. inhibit calcium resorption from bones.
d. promote thyroid hormone release.
ANS: C
Calcitonin lowers serum calcium levels by inhibition of bone-resorbing osteoclasts.
Calcitonin does not activate vitamin D, stimulate bone-resorbing osteoclasts, or promote thyroid hormone release.
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