CAIE A-Level Biology AS 9.1.7 Gas Exchange Between Alveolar Air and Blood Questions

Explain alveolar gas exchange and diffusion factors using evidence from each question and mark scheme.

Exam points

Explain gas exchange between alveolar air and blood and the factors affecting diffusion.

[Maximum number: 1]

Exchange of carbon dioxide and oxygen occurs between air in the alveoli and blood in the capillaries of the lung.

Which partial pressures of the gases will allow gaseous exchange to occur?

$\mathrm{CO}_{2}$ in alveolar air /kPa

$\mathrm{CO}_{2}$ in blood /kPa

$\mathrm{O}_{2}$ in alveolar air /kPa

$\mathrm{O}_{2}$ in blood /kPa

5.3

6.0

13.3

13.9

5.3

6.0

13.9

5.3

6.0

5.3

13.9

5.3

6.0

5.3

13.3

13.9

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