<prompt> Parietal cell secretesMucusPepsinogensGastrinIntrinsic factor  <response>: Parietal cells located deep in the oxyntic glands secrete HCl intrinsic factor. -Mucus is secreted by mucous neck cells of oxyntic glands. Pepsinogen is secreted by chiefpeptic cells of oxyntic glands. -G cells of pyloric glands release hormone gastrin. Reference: Guyton,11e 