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Epithelium or epithelial tissue is a thin, continuous, protective layer of cells with little extracellular matrix. An example is the epidermis, the outermost layer of the skin. Epithelial (mesothelial) tissues line the outer surfaces of many internal organs, the corresponding inner surfaces of body cavities, and the inner surfaces of blood vessels.
The basement membrane acts as a mechanical barrier, preventing malignant cells from invading the deeper tissues. [7] Early stages of malignancy that are thus limited to the epithelial layer by the basement membrane are called carcinoma in situ. The basement membrane is also essential for angiogenesis (development of new blood vessels).
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Goblet cells are simple columnar epithelial cells, having a height of four times that of their width. The cytoplasm of goblet cells tends to be displaced toward the basal end of the cell body by the large mucin granules, which accumulate near the apical surface of the cell along the Golgi apparatus, which lies between the granules and the nucleus.
Cells within tissues and organs must be anchored to one another and attached to components of the extracellular matrix. Cells have developed several types of junctional complexes to serve these functions, and in each case, anchoring proteins extend through the plasma membrane to link cytoskeletal proteins in one cell to cytoskeletal proteins in ...
Each serous membrane is composed of a secretory epithelial layer and a connective tissue layer underneath.. The epithelial layer, known as mesothelium, consists of a single layer of avascular flat nucleated cells (simple squamous epithelium) which produce the lubricating serous fluid.
Image credits: Stewart Cook/ABC/Getty Images While Ozempic is not approved for weight loss, some physicians prescribe it for this purpose, as per UC Davis Health.. Ozempic can help with weight ...
Electronic flashcards may have a three-sided card. [2] Such a card has three fields, Q, A, and A*, where Q & A are reversed on flipping, but A* is always in the answer—the two "sides" are thus Q/A,A* and A/Q,A*. These are most often used for learning foreign vocabulary, where the foreign pronunciation is not transparent from the foreign writing.