Calcitonin and parathyroid hormone play opposite roles in calcium homeostasis such that
A) calcitonin increases-and parathyroid hormone decreases-blood calcium levels.
B) calcitonin decreases-and parathyroid hormone increases-blood calcium levels.
C) calcitonin is secreted when blood calcium levels are low and parathyroid hormone is secreted when blood calcium levels are high.
D) calcitonin increases calcium absorption in the intestines and parathyroid hormone decreases calcium absorption in the intestines.
Correct Answer:
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