The tissues of the lungs

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The tissues of the lungs

  1. 1. The lungs
  2. 2. Learning outcomes <ul><li>Explain the terms tissue and organ and the relationship between them </li></ul><ul><li>Identify the differences between squamous epithelium, ciliated epithelium goblet cells </li></ul><ul><li>Make connections between the lung DVD and structure of lungs </li></ul>
  3. 4. definitions <ul><li>Tissue – a group of similar cells specialised to carry out the same function </li></ul><ul><li>Organ – a structure made up of different kinds of tissue. E.g. Lung – squamous epithelium; elastic tissue </li></ul>
  4. 6. Squamous epithelium
  5. 7. Squamous epithelium – make up the alveoli (tiny holow sacs in the lungs) <ul><li>Thin, flattened cells </li></ul><ul><li>Epithelium – a lining tissue </li></ul><ul><li>Advantages – short distance between air in the alveoli and the blood in the capillary. This means gas exchange is very efficient </li></ul>
  6. 8. Goblet cells
  7. 9. Goblet cells <ul><li>Shaped like a goblet (hence their name) </li></ul><ul><li>Produce large amounts of mucus (a glycoprotein) </li></ul><ul><li>Dirt and bacteria in the air that is breathed in gets trapped in the mucus. When mucus reaches the throat it is swallowed. The dirt and bacteria is then destroyed by the acid and enzymes in the stomach. </li></ul>
  8. 10. CILIATED EPITHELIUM <ul><li>Ciliated epithelium </li></ul><ul><li>Ciliated epithelium </li></ul>
  9. 11. Ciliated epithelium <ul><li>Have tiny hairs called cilia. </li></ul><ul><li>Beat together in a rhythm moving mucus back up the trachea into the throat. </li></ul><ul><li>Cigarette smoke damages cilia – why do smokers have a persistent chesty cough and are prone to lung infections? </li></ul>

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