PHSL233 Lecture Notes - Paracellular Transport, Laminin, Serous Membrane
24 Jul 2013
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Document Summary
Epithelia is a sheet of cells that line body cavities surfaces which can separate 2 different environments. They come as sheets and there are different types, respiratory and follapian tubes have cillia on them, on the digestive system there are microvilli which allows absorption. So they take on different types depending on their job. Simple are just one layer of epithelia cells, they can be squamous, cuboidal or columnar. More than one layer is referred to as being stratified, and transitional. Epithelia cells have 4 main functions, protection such as epidermis which is a type of epithelia cell that is called skin, they help with our outer protection with the environment. There are number of modified epithelia cells that allow us to sense things such as organs in ear and nose. They also have a secretatory and absorption function, also they can excrete.
