What correctly describes the effect of carcinogens on lung tissue?
1 )
Cells of the alveoli walls divide more rapidly than normal by reduction division causing a tumour to develop.
2 )
Cilia are paralysed and mucus accumulates in the lungs, causing DNA to change and a tumour to develop.
DNA changes, causing bronchial epithelial cells to divide by mitosis in an uncontrolled way, causing a tumour to develop.
4 )
Haemoglobin carries less oxygen, causing bronchial cells to divide by mitosis in an uncontrolled way, causing a tumour to develop.
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