Biology 9700 · AS & A Level · The circulatory system

The circulatory system — practice question

What effect could result from breathing in the nicotine present 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

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