ConceptConceptDocsDocuments

CAIE IGCSE Biology 11 Gas Exchange in Humans

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

11. 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 ]

11. Gas exchange in humans 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.

11. Gas exchange in humans question 3

[Maximum number: 11]

Question (a)

(a)

Complete Table 3.1 by writing in the percentages of carbon dioxide and oxygen in inspired air and in expired air.

Table 3.1

Table 3.1

[ 2 ]

Question (b)

(b)

A scientist measured the number of dust particles in inspired air and in expired air.

They found fewer dust particles in expired air.
Suggest a reason for their observation.

[ 1 ]

Question (c)

(c)

Fig. 3.1 is a diagram of alveoli and associated blood vessels.

Fig. 3.1

Fig. 3.1

[ 2 ]

Question (i)

(i)

State the location and function of cartilage in the breathing system.
location
function

[ 2 ]

Question (d)

(d)

A student measured the rate and depth of breathing of an athlete for 30 seconds at rest. The data are shown in Fig. 3.2.

Fig. 3.2

Fig. 3.2

[ 6 ]

Question (i)

(i)

Using the information in Fig. 3.2, calculate the rate of breathing at rest. breaths per minute

The measurements were repeated while the athlete was running on a treadmill.
The data are shown in Fig. 3.3.

Fig. 3.3

Fig. 3.3

[ 1 ]

Question (ii)

(ii)

Using the information in Fig. 3.3, calculate the volume of air inspired in one breath from 25 seconds. dm3\mathrm{dm}^{3}

[ 1 ]

Question (iii)

(iii)

Explain the effect of exercise on the rate and depth of breathing shown in Fig. 3.2 and Fig. 3.3.

[ 4 ]
All question bank results loaded