How does the body respond to calcium levels greater than 10.5 mg/dL?
A. When the plasma calcium level reaches 10.5 mg/dL, calcitonin is secreted, which raises the level of circulating calcium by potentiating the effect of PTH on bone.
B. When the plasma calcium level reaches 10.5 mg/dL, calcitonin is secreted, which lowers the level of circulating calcium by antagonizing the effect of parathormone (PTH) on bone.
C. When the plasma calcium level reaches 10.5 mg/dL, PTH is secreted, which lowers the level of circulating calcium by antagonizing the effect of calcitonin on bone.
D. None of these are correct.
Answer: B
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