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