Which of the following is the only essential function of the stomach?

A surgical procedure known as gastric bypass involves creating a small upper stomach pouch and attaching part of the small intestine to this pouch, “bypassing” the rest of the stomach and part of the duodenum.

How would bypassing a significant portion of the stomach affect absorption of vitamin B12? Explain.

How does each of the three phases of gastric secretion promote and facilitate gastric control?

Describe the regulation of the cephalic, gastric, and intestinal phases of gastric secretion.

Proton Pump Inhibitors (or PPIs) are some of the widely used drugs in the world and are prescribed for chronic heartburn/acid reflux. They work by inhibiting the movement of H⁺ ions across the membrane into the gastric juice, thereby lowering the concentration of HCl. As described, which cell of the gastric glands would you expect PPIs to affect?