Question

Oxygen is absorbed through the alveoli in the lungs. How are the alveoli adapted for this function? [3 MARKS]

Answer 1

Each point: 1 Mark

Some features of the alveoli that allow this are as follows:

• they increase the surface area in lungs for absorption

• they have thin walls (just one cell thick)

• they have a lot of tiny blood vessels called capillaries.