Structure of the Lungs

Textbook 4.1 notes

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  • Created by: Mima
  • Created on: 08-01-13 21:00
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  • The Lungs - 4.1, structure
    • Lungs
      • Pair of lobed structures
      • Made up of branched tubules (bronchioles)
        • End with the alveoli
    • Trachea
      • Flexible airway
      • Supported by rings of cartilidge
        • prevents the trachea collapsing as the air pressure decreased when breathing in
      • Walls made up of muscle
        • lined with ciliated epithelilium and goblet cells
          • Goblet cells produce mucus to trap particles
          • Cilia move the mucus up to the throat then to the stomach
    • Bronchi
      • Similar in structure to trachea
      • Produce mucus to trap particles and have cilia
      • Suuported by cartalidge, which reduces as they get smaller
    • Bronchioles
      • series of branching subdivisions of the bronchi
      • Their walls are made of muscle alines with epithelial cells
        • this muscle  alows them to constrict controlling the flow of air in and out of the alveoli
    • Alveoli
      • Are minute air sacs
        • at end of bronchioles
        • 100µm-300µm
      • Contain some collagen and elastic fibres, lined with epithelium
        • allows the alveoli to stretch as air fills in
        • spring back as breathe out to expel carbon dioxide
    • Mammalian Lungs
      • Located inside the body
        • air is not enough density to support and protect these delicate strucutres
        • they would otherwise lose a vast amount of water and dry out
    • Aerobic respiration
      • requires constant supply of oxygen and ATP


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