Which of the following statements is true of calcium homeostasis?
A. Hypercalcemia stimulates calcitonin secretion, while hypocalcemia stimulates the secretion of parathormone (PTH).
B. Calcitriol is a form of vitamin D that facilitates calcium absorption from the GI tract, thus increasing the level of circulating calcium.
C. Plasma calcium is maintained at 9.0 to 10.4 mg/dL for men and 8.9 to 10.2 mg/dL for women.
D. All of these are correct.
Answer: D
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