Blood Ca2+ deficiency stimulates ________ secretion, which leads to ________.
A. growth hormone; increased osteoblast activity
B. calcitriol; more urinary phosphate excretion
C. thyroid hormone; less urinary calcium excretion
D. calcitonin; more urinary phosphate reabsorption
E. parathyroid hormone; increased osteoclast activity
Answer: E
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