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.
Types of epithelium: Epithelia are classified according to the number of layers of cells they contain and the shape of the cells. If the cells are arranged in a single layer, the epithelium is called simple; if the cells are arranged in two or more layers, the epithelium is called stratified.f the cells have a flattened shape, the epithelium is called squamous; if the cells have about the same height, width and depth, it is called cuboidal; if the height of the cells exceeds their width, it is called columnar.