An increase in calcium concentration can be associated with an increase in stomach acidity. This process is similar to the processes involved in neurotransmitter and insulin release. How is calcium associated with increased stomach acid? a. Calcium binds to the alpha subunit of a G protein activating proton pumps already on the membrane. b. Calcium is pumped out of the cell by an ATPase and as a result this lowers the pH of the gut. c. Calcium influx into the cell allows vesicles containing proton pumps on their membranes to fuse with the cellular membrane. d. Calcium influx into the cell allows vesicles filled with protons to fuse with the cellular membrane. e. Calcium binds to acetylcholine receptors on Parietal cells and opens gated proton channels releasing protons from the cytoplasm to outside the cell.

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