View mindmap
  • Smoking
    • Tar
      • general name given to toxic chemicals in cigarette smoke
        • many of chemicals are carcinogenic
    • Lung Cancer
      • - tar damages DNA in epithelial cells
    • Emphysema
      • tar damages alveolar lining and breaks down the alveolar wall - SA of lungs reduced
        • air in damaged alveoli cant be expelled preventing fresh air being taken in
    • Bronchitis
      • - bronchioles are inflamed and narrow
        • - increased mucus production reduces air flow
          • - cilia in air passages are damaged by tar
      • symptoms - coughing, loss of breath, increased susceptibility to infection


No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Principles of Exchange and Transport resources »