Cigarette smoke contains tar.
Which statements describe the effect of tar on the respiratory system?
1) Tar causes goblet cells to increase the secretion of mucus.
2) Tar increases the risk of blood clots forming inside blood vessels.
3) Tar may cause changes to the DNA in epithelial cells.
1 )
1, 2 and 3
2 )
1 and 2 only
1 and 3 only
4 )
2 and 3 only
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