When blood Ca2+ levels fall below normal, in what ways do the kidneys help restore them toward normal?
A. by increasing 1,25-dihydroxyvitamin D3 formation, decreasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption
B. by increasing 1,25-dihydroxyvitamin D3 formation, increasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption
C. by decreasing 1,25-dihydroxyvitamin D3 formation, increasing tubular phosphate reabsorption, and increasing tubular Ca2+ reabsorption
D. Increasing 1,25-dihydroxyvitamin D3 formation and increasing secretion of parathyroid hormone
E. by increasing renal secretion of parathyroid hormone and increasing bone resorption
A
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