Start by creating a new file named âweb_server.jsâ. Insert the following code into the file and save it. To start the server, type the command shown below. If everything works properly, you will see a message that the server is listening.
Epithelia are classified on the basis of the number of cell layers and the shape of the cells in the surface layer. * If there is only one layer of cells in the epithelium, it is designated simple. * If there are two or more layers of cells, it is termed stratified.* Cells in the surface layer are, as a rule, described according to their height as squamous (scale-or plate-like), cuboidal or columnar.Examine each of the basic types of cells so that you get an understanding for how the layers are organized and how they are named.pithelia are classified on the basis of the number of cell layers and the shape of the cells in the surface layer. * If there is only one layer of cells in the epithelium, it is designated simple. * If there are two or more layers of cells, it is termed stratified.
Examples. There is epithelial tissue in the skin. Epithelial tissue forms the inner lining of the stomach, lungs, and blood vessels. Types of epithelial tissue There are different types of epithelial tissue, distinguished by the different shapes of their constituent cells: squamous, cuboidal, and columnar.