A-LevelBiologyControl and coordination9700/12 · May/June 2011 · Q331 Mark

What could occur as a result of inhaling the nicotine in tobacco smoke?

Acilia lining the respiratory tract are paralysed, causing an increase in the secretion of mucus from enlarged goblet cells

Bdiffusion into blood capillaries followed by the release of adrenaline, which increases blood pressure and heart rate

Cdiffusion into the epithelial cells of the respiratory tract, increasing the risk of mutation and acting as a potential carcinogen

Ddissolves in the lining of the alveoli, causing a breakdown in the alveolar walls and a decrease in surface area for gas exchange

✓ Correct answer

B: diffusion into blood capillaries followed by the release of adrenaline, which increases blood pressure and heart rate

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Topic: Control and coordination, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2011 Paper 1 Variant 2, question 33.

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