Explain the parathyroid gland cells, Biology

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A new drug named AGON-CaSR has been developed that is an agonist at calcium-binding sites of CaSRs (Calcium-Sensing Receptors) in plasma membranes of parathyroid gland cells. 

Healthy Person P receives regular doses of AGON-CaSR as part of a clinical trial.  When AGON-CaSR levels in the extracellular spaces surrounding parathyroid gland cells increase in Healthy Person P, this leads to

A. A decrease in the levels of calcium in the blood plasma.

B. A decrease in the levels of parathyroid hormone (PTH) in the blood plasma.

C. An increase in the amount of PTH binding to PTH Receptors in bone.

 


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