IB Biology SL 3.1.2 Properties of Gas-Exchange Surfaces Question Bank

Practise IB Biology SL 3.1.2 using exact SL questions on alveolar diffusion, surface area, concentration gradients and loss of gas-exchange tissue.

Exam points

Explain how large, thin alveolar surfaces support oxygen and carbon-dioxide diffusion.
Relate concentration gradients and capillary contact to gas exchange across alveolar walls.
Use emphysema evidence to explain how loss of alveolar surface reduces gas exchange.

[Maximum number: 1]

Emphysema is a condition where the alveoli of the lungs are destroyed, resulting in patients feeling out of breath. The micrograph shows air pockets resulting from emphysema.

Figure for Question B3.1.2—Properties of gas-exchange surfaces question 1 — IB Biology SL

What is a direct consequence of the destruction of alveoli?

Decrease in surface area for gas exchange

Increased blood flow to the lungs

Increase in pulmonary surfactant production

Decrease in ventilation rate

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B3.1.2—Properties of gas-exchange surfaces question 1