Epithelial Tissue

• Definition of epithelial tissue is a lining tissue which covers body surfaces
• Epithelial tissue line body cavities hollow organs and ducts
• ET forms glandular epithelium
• Features of the epithelial tissue

  Closely packed cells

  Single or multiple layers of cells
• The basement membrane


  The bottom layer of cells that sits on a thin fibrous sheet
• True or false; Blood vessel do not penetrate the layers of cells

  True
• Nerves sometimes can penetrate the layers
• Function of epithelial tissue

  Protection - Against microbrial infection, drying out and harmful environments

  Secretion - of fluids eg sweat, saliva and hormones

  Absorption - of nutrients fluids and chemical

  Excretion - Removal of waste products
• What are the three types of cell layers (classification of ET)

  Single - single layer

  Stratified - More than one layer of cells

  Pseudostratified - single layer but not all cells reach the surfaces, appears layered but isnt
• 3 types of ET (Classification)

  Squamous

  Cuboidal

  Columnar
• 3 examples of exocrine glandular secretion

  mucus

  saliva

  milk
• Example of endocrine glandular secretion

  Hormones