Which of the following serves as a sensor, or as part of a sensor, that functions in a negative feedback system?
A. CaSRs (Calcium-Sensing Receptors) located in the plasma membranes of Parathyroid Gland cells.
B. muscarinic Acetylcholine Receptors (mAChRs) located in the plasma membranes of SA node cells.
C. Force-gated (mechanically-gated) channels in the plasma membranes of mechanoreceptor (force-sensitive) neurons whose central terminals are located in the walls of the carotid artery.