Bronchus lung cancer. Coloured Scanning Electron Micrograph (SEM) of the epithelium of a human bronchus of the lung, suffering from cancer. The epithelium forms a mucous membrane that lines the lung airways. It contains clumps of hair-like cilia (seen here) and goblet cells which secrete mucus. Due to cancer, chaotic cell growth has made this surface uneven. Blood cells (red) have also leaked out due to haemorrhage. Cancerous growth and the uneven surface means that the cilia, which normally beat to remove particles trapped in the mucus, are less effective and airways block up. This is the commonest form of lung cancer caused by smoking. Magnification: x600 at 6x6cm size.

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