Epithelial tissue/function

• What is an epithelial tissue 


  the lining organs and surfaces
• What are the 3 epithelial tissues


  squamous, columnar, endothelium tissues
• Squamous epithelia tissues have


  organise themselves in a smooth,

  thin layers

  rapid diffusion

  lies in alveoli of lungs
• Emphysema


  where smoking damages the tissue causing more mucus and becomes thicker
• Symptoms of epithelial tissue


  breathlessness

  persistent coughing

  phlegm
• Ciliated columnar...


  make the lining of the trachea (windpipe)

  made up of column-shaped ciliated cells and hair-like structures (cilia)
• Endothelial tissue..

  -lines inner walls of blood vessels and the heart

  -1 cell thick, for short diffusion pathways of substances in and out of blood vessels
• endothelium tissue have fatty substances..


  in blood like cholesterol and saturated fats and stored under endothelial tissue.

  -too much blood can build breaks through the tissue causing atherosclerosis as plaque keeps building and narrowing lumen vessels