Which of the following effectors (marked C in the figure) are activated in response to decreases in blood calcium concentrations? 
A) parathyroid gland cells and intestinal epithelial cells
B) osteoclasts and kidney cells
C) thyroid gland cells and skin epithelial cells
D) osteoblasts and osteoclasts
E) hypothalamic neurons and pituitary gland cells
Correct Answer:
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