Which of the following statements regarding Ca2+ homeostasis is TRUE?
A. In the absence of parathyroid hormone, plasma Ca2+ levels would be abnormally low, resulting in the hyperpolarization of nerve and muscle membranes.
B. Parathyroid hormone directly stimulates Ca2+ absorption from the GI tract.
C. When plasma Ca2+ increases above normal, the secretion of parathyroid hormone increases.
D. Vitamin D decreases the renal tubular reabsorption of Ca2+.
E. Parathyroid hormone directly stimulates Ca2+ reabsorption by the kidneys.
Answer: E
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