A-LevelBiologyGas exchange9700/12 · Oct/Nov 2013 · Q331 Mark
Which statements are correct effects of tar in tobacco smoke on the human gas exchange system? [Figure 33.1]
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Agoblet cells are stimulated to secrete more mucus: ✓, mucus glands in the trachea are enlarged: ✓, mutations may occur in epithelial cells forming tumours: ✗, the activity of cilia in the airways is inhibited: ✗
Bgoblet cells are stimulated to secrete more mucus: ✗, mucus glands in the trachea are enlarged: ✓, mutations may occur in epithelial cells forming tumours: ✓, the activity of cilia in the airways is inhibited: ✓
Cgoblet cells are stimulated to secrete more mucus: ✓, mucus glands in the trachea are enlarged: ✗, mutations may occur in epithelial cells forming tumours: ✓, the activity of cilia in the airways is inhibited: ✓
Dgoblet cells are stimulated to secrete more mucus: ✓, mucus glands in the trachea are enlarged: ✗, mutations may occur in epithelial cells forming tumours: ✗, the activity of cilia in the airways is inhibited: ✗
✓ Correct answer
C: goblet cells are stimulated to secrete more mucus: ✓, mucus glands in the trachea are enlarged: ✗, mutations may occur in epithelial cells forming tumours: ✓, the activity of cilia in the airways is inhibited: ✓
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