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The chief and parietal cells produce and secrete mucus (F) to protect the lining of the stomach (C) against the harsh pH of stomach acid. The mucus is basic, while the stomach acid (A) is acidic. In the human digestive system, mucus is used as a lubricant for materials that must pass over membranes, e.g., food passing down the esophagus.
The mucosa is composed of one or more layers of epithelial cells that secrete mucus, and an underlying lamina propria of loose connective tissue. [1] The type of cells and type of mucus secreted vary from organ to organ and each can differ along a given tract. [2] [3]
Above the Peyer’s patches is a layer of epithelial cells, which together with the mucus form a barrier against microbial invasion into the underlying tissue. Antigen sampling is a key function of Peyer’s patches. Above the Peyer’s patches is a much thinner mucus layer that helps the antigen sampling. [14]
Mucus is actually the body's first line of defense against bacterial and viral infections. One of the proteins found in mucus — the antibody IgA — protects against pathogens in your nose and ...
The cells in the respiratory epithelium are of five main types: a) ciliated cells, b) goblet cells, c) brush cells, d) airway basal cells, and e) small granule cells (NDES) [6] Goblet cells become increasingly fewer further down the respiratory tree until they are absent in the terminal bronchioles; club cells take over their role to some extent here. [7]
"Mucus is very helpful in terms of our immune system," Elliott says. "When you have a foreign particle like pollen or a virus or bacteria, your mucosal cells — which produce mucus — are ...
Mucus forms a layer (or layers, in the case of the colon) that separates the bulk of the luminal contents from the intestinal epithelium. The mucus consists of a highly glycosylated hydrated gel formed by mucin molecules that are secreted by goblet cells. The mucus prevents large particles from contacting the epithelial cell layer while ...
The mucus layer is about 300 μm ... the bacteria produce and secrete extracellular polymeric ... and provides protection from heat and competition from other ...
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