Multiple Choice
With reference to the negative feedback system shown in the figure above, which of the following descriptions best describes the receptors (marked A in the figure) used to detect decreases in blood calcium concentrations? 
A) Parathyroid gland cells detect lowered calcium levels.
B) Neurons in the hypothalamus detect lowered calcium levels.
C) Thyroid gland cells detect lowered calcium levels.
D) PTH genes detect lowered calcium levels.
E) Osteoclasts detect lowered calcium levels.
Correct Answer:
Verified
Correct Answer:
Verified
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