Which of the following best describes control center activity (marked B in the figure) when low blood calcium levels have been detected? 
A) Parathyroid gland cells decrease production of PTH.
B) Neurons in the hypothalamus are activated.
C) Thyroid gland cells increase thyroid hormone production.
D) The PTH gene in parathyroid gland cells gets turned on.
E) Osteoclasts interpret chemical signal coming from parathyroid gland.
Correct Answer:
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