The Lungs

6 Questions | Total Attempts: 68

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The Lungs

AS HUMAN BIOLOGY


Questions and Answers
  • 1. 
     Label the lungs from A to G, seperate with a coma and space
  • 2. 
    The alveoli are the actual site of ____ exchange. They are tiny hollow sacs made of thin, flattened cells called ______ ________. This is an example of a tissue. 
  • 3. 
    The trachea has rings of _______ around it to make sure that is stays open when you breathe in and out. It is lined with a layer of ______ _________ and ______ cells.
  • 4. 
    _____ cells produce large amounts of mucus, which is a glycoprotein. The _____ epithelium cells have many tiny hairs called _____. These beat together in a rhythm and move the mucus up the trachea to the throat. Dirt and bacteria in the air that is breathed in gets trapped in the _____. When it reaches the throat, it is _________.
  • 5. 
    The alveolus wall contains some elastic fibres. These allow the alveoli to _____ when breathing in, and _____ easily when breathing out. The alveoli are also lined with a watery fluid called __________. It lowers the suface _____ of the alveoli and therefore reduces the amount of effort needed to breathe in and inflate the lungs.
  • 6. 
    The lungs are adapted for effecient gas exchange. A ____ surface area
    • The ________ are highly branched, giving a large number of pathways for air to enter and leave the _____.
    • The are millions of _____ in each lung.
    • The alveoli are highly _____, giving an even greater surface area.
    A ____ surface
    • The ______ epithelium cells in the alveoli are very small, which allows rapid ______ across them.
    • The __________ wall is also made of a single layer of thin, flattened cells.
    A steep _____ gradient
    • The blood circulation carries _______ blood away from the alveoli, and brings _________ blood to the alveoli.
    • The capillaries surrounding the alveoli are narrow, slowing down the ________ and allowing plenty of time for effecient ____ exchange.