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Thus, the ability of the partietal cell to secrete acid is dependent on active transport. The key player in acid secretion is a H+/K+ ATPase or proton pump located in the cannalicular membrane. This ATPase is magnesium-dependent, and not inhibitable by ouabain. Hydrogen ions are generated within the parietal cell from dissociation of water.
The proton is located in the center (or nucleus) of an atom, each atom has at least one proton. Protons have a charge of +1, and a mass of approximately 1 atomic mass unit (amu). Elements differ from each other in the number of protons they have, e.g. Hydrogen has 1 proton; Helium has 2. The neutron also is located in the atomic nucleus (except in Hydrogen). The neutron has no charge, and a mass of slightly over 1 amu. Some scientists propose the neutron is made up of a proton and electron-like particle. The electron is a very small particle located outside the nucleus.