One layer of the wall of 
One layer of the wall of this organ, the submucosa, contains Meissner's plexus. Its chief cells secrete pepsinogen, which is converted to its active form in response to the low pH environment present in this organ. This organ receives the bolus through the cardiac (*) sphincter, converts it to chyme, then passes it through the pyloric sphincter to the small intestine. For 10 points, name this organ of the digestive system with parietal cells that secrete hydrochloric acid.
One layer of the wall of this organ, the submucosa, contains Meissner's plexus.
stomach