Which flow diagram correctly describes the effect of tar entering the lungs?
carcinogens come into contact with DNA → mutation occurs → uncontrolled cell division → mass of cells produced
2 )
goblet cells secrete more mucus → mucus accumulates causing infection → phagocytes attracted by inflammation → causes irritation and coughing
3 )
goblet cells secrete more mucus → mutation occurs → phagocytes attracted by inflammation → mass of cells produced
4 )
phagocytes attracted by inflammation → mutation occurs → uncontrolled cell division → elastase destroys the alveolar walls
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