Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water â hence the name photosynthesis, from the Greek Ïá¿¶Ï, phÅs, light, and ÏÏÎ½Î¸ÎµÏÎ¹Ï, synthesis, putting together. In most cases, oxygen is also released as a waste product. Most plants ...
Chief cells of the stomach secrete the digestive enzymes (pepsins) of the stomach and have the typical appearance of serous-secretory epithelial cells. Secretory vesicles (containing pepsinogen) are clearly visible in the apical cytoplasm of chief cells.
If the lining of the stomach is examined with a hand lens, one can see that it is covered with numerous small holes. These are the openings of gastric pits which extend into the mucosa as straight and branched tubules, forming gastric glands. Types of Secretory Epithelial Cells.1  Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid. 2  Parietal cells: secrete hydrochloric acid! 3  Chief cells: secrete pepsin, a proteolytic enzyme. 4  G cells: secrete the hormone gastrin.here are differences in the distribution of these cell types among regions of the stomach-for example, parietal cells are abundant in the glands of the body, but virtually absent in pyloric glands.