lungs and gas exchange

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  • lungs and gas exchange
    • the heart pumps low oxygen/high carbon dioxide blood to lungs
    • trachea
      • carries air to/from the lungs
      • rings of cartilage protect the airway
    • bronchioles
      • carries air to/from the air sacs (alveoli)
      • splits into multiple pathways to reach all the alveoli
    • alveoli
      • site of gas exchange
      • maximises surface area for efficient gas exchange
    • capillaries
      • allows gas exchange between into/out of blood

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