PTH is secreted in a regulated manner. Which of the following directly increases PTH synthesis and/or secretion?
A. elevated 1,25-dihydroxyvitamin D
B. decreased blood phosphate levels (hypophosphatemia)
C. decreased blood Ca++ levels (hypocalcemia)
D. elevated blood K+ levels (hyperkalemia)
E. elevated Mg++ levels (hypermagnesemia)
ANS: C
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