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From Wikipedia, the free encyclopedia. Gastrin is a peptide hormone that stimulates secretion of gastric acid (HCl) by the parietal cells of the stomach and aids in gastric motility. It is released by G cells in the pyloric antrum of the stomach, duodenum, and the pancreas.
When the expiratory. phase starts, the exhalation valve opens to release gas from. the patientâs respiratory system. Traditionally, the exhala-. tion valve is fully closed during the inspiratory phase, and. gas can be released from the patientâs respiratory system. only during the expiratory phase.