Biology 9700 · AS & A Level · The gas exchange system
The gas exchange system — practice question
A study involving a large group of people, including some smokers, was conducted. It examined the connection between the percentage of deaths from lung cancer in smokers and their smoking patterns. The age when they began smoking and the number of cigarettes smoked each day were noted. The findings are displayed in Fig. 3.1.
(a)[4]
Explain what the results in Fig. 3.1 indicate about the relationship between cigarette smoking and percentage of deaths due to lung cancer.
(b(i))[2]
Tobacco smoke includes many substances that are harmful to the body.
Outline the harmful effects on the cardiovascular system of carbon monoxide.
(b(ii))[2]
Tobacco smoke includes many substances that are harmful to the body.
Outline the harmful effects on the cardiovascular system of nicotine.
(b(iii))[4]
Describe briefly the effects of tar on the goblet cells and cilia of the trachea.
goblet cells
cilia
Worked solution & mark scheme
This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Non-smokers show the lowest percentage of deaths due to lung cancer” …