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