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CAIE IGCSE Biology 11 Gas Exchange in Humans Questions

Practise labelling airways, explaining alveolar exchange and interpreting ventilation, air-composition and exercise data.

Syllabus
2026–2028
Course
Biology 0610

Covered syllabus points

11.1 Gas exchange in humans

Question 1

[Maximum number: 16]

Question (a)

(a)

Fig. 6.1 shows part of the human gas exchange system.

Fig. 6.1

Fig. 6.1

[ 10 ]

Question (i)

(i)

Table 6.1 shows the names of some parts of the human gas exchange system, their functions and the letters in Fig. 6.1 that identify the parts.

Complete Table 6.1.

Table 6.1

Table 6.1

[ 7 ]

Question (ii)

(ii)

Describe and explain how the alveoli are adapted for gas exchange.

[ 3 ]

Question (b)

(b)

Explain the differences in composition between inspired and expired air.

[ 3 ]

Question (c)

(c)

Physical activity changes the concentration of carbon dioxide in the body.

State where this change is detected and how the body responds to the change.

[ 2 ]

Question (d)

(d)

State the name of a solution that can be used to test for the presence of carbon dioxide gas.

[ 1 ]

Question 2

[Maximum number: 1]

Substances move between blood and tissues at various sites in the circulatory system of mammals.

Oxygen is absorbed into the blood as it passes through the lungs.

State the structures in the lungs where oxygen passes into the blood from the air.

Question 3

[Maximum number: 1]

Which row shows the composition of expired air from a healthy person?

carbon dioxide
\%

oxygen
\%

water vapour

0.04

21

saturated

0.04

16

variable

4

21

variable

4

16

saturated

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