epithelial tissue

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  • epithelial tissue
    • protects blood vessles and organs
    • is supported by a basement membrane and can consist of simple and stratified layer of cells
      • simple- one layer
      • stratified- multiple layers
    • they are classified into shapes:
      • squamous: flat and scale like
        • simple: so thin that is offer s no protection. its function allows materials to pass through
        • stratified: is usuallly made up of many layers of cells that it offers the best protection to the blood vessles or organs underneath
      • cuboidal: tall as they are wide
        • simple: offers some protection but it more prevalent when materials must be secreted or absorbed.
        • stratified: typically only found in areas where secretion os importantbut where a little more protection is needed than just simple cuboidal
      • columnar: tall and column shaped
        • simple: offers some protectioon of underlying tissue. it's found in places where protection is nessary and where secretion occurs
        • stratified: these are rare and are found in places requiring ultimate protection and where secretion occurs
    • characteristics
      • they have one basal section
      • nutrients are from the baement membrane as they lack blood vessels
      • they are sensory
      • fix themselves through mitosis
      • can have cilia or microvilli
      • compacted tightly together in one layer


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