Gas exchange in humans — IGCSE Biology (0970) questions by topic
Gas exchange in humans questions sequence the events of exercise from breathing rate increasing through receptor activity in the brain, identify the features, such as thin walls and large surface area, that all gas exchange surfaces share, name labelled parts of the human gas exchange system such as the bronchiole and alveoli, and order the stages of expiration correctly.
State, choose, identify, describe and explain carry 1 to 20 marks across 23 real questions from 2023 to 2025 papers. Because sequencing questions here reward getting every stage in the right causal order, submitting an ordered answer for instant marking flags exactly which stage, such as diaphragm movement before or after pressure change, has been placed out of sequence.
May–June 2025, Paper 11
The table shows the concentration of gases in a blood vessel and in an alveolus. Which row shows the conditions that cause a substance produced in respiration in humans to diffuse…
Answer this question and get it marked →Which statements describe the difference between the composition of inspired air and expired air? 1 The percentage of carbon dioxide in inspired air is greater than in expired…
Answer this question and get it marked →May–June 2025, Paper 12
Which substance can be used to test for carbon dioxide? A DCPIP B ethanol C iodine solution D limewater
Answer this question and get it marked →May–June 2025, Paper 21
The graph shows how the volume of air in lungs changes when a person is breathing at rest. The trace is a smooth wave of repeated breaths; point X is marked at a peak (maximum…
Answer this question and get it marked →May–June 2025, Paper 22
The table shows the breathing rate and the average total volume of air breathed by a student when exercising for 20 minutes. time /minutes breathing rate /breaths per minute…
Answer this question and get it marked →May–June 2025, Paper 32
Fig. 5.1 is a diagram of some of the muscles and bones found in the human gas exchange system. Complete Fig. 5.1 by labelling the structures in the spaces provided. [Fig. 5.1:…
Answer this question and get it marked →May–June 2025, Paper 42
Fig. 1.1 shows part of the human gas exchange system. The diagram shows the trachea (with rings of cartilage labelled), which branches into the lungs. Structure A points to the…
Answer this question and get it marked →May–June 2024, Paper 11
The diagram shows the breathing system with structures labelled A, B, C and D. Which structure is the diaphragm? A B C D
Answer this question and get it marked →May–June 2024, Paper 21
What are the functions of the diaphragm and the cilia in the human gas exchange system? Columns: diaphragm; cilia. A contracts to cause breathing in; carry mucus to the throat B…
Answer this question and get it marked →May–June 2024, Paper 22
These changes occur in the human body during exercise. 1 breathing rate increases 2 the rate of respiration increases 3 nerve impulses sent from the brain to the intercostal…
Answer this question and get it marked →October–November 2024, Paper 32
Alveoli are the gas exchange surfaces in humans. State two features of gas exchange surfaces in humans. 1 2
Answer this question and get it marked →October–November 2024, Paper 42
Fig. 2.1 is a diagram of the gas exchange system in humans showing: trachea at top, two lungs, with parts labelled X (bronchus/bronchiole), Y (alveoli cluster), and Z (diaphragm…
Answer this question and get it marked →May–June 2023, Paper 11
What is the pathway of expired air as it travels out of the body? A alveoli → trachea → bronchiole → bronchi B alveoli → bronchiole → bronchi → trachea C trachea → alveoli →…
Answer this question and get it marked →May–June 2023, Paper 12
What are features of gas exchange surfaces in animals? A thick-walled and large surface area B thick-walled and small surface area C thin-walled and small surface area D…
Answer this question and get it marked →The diagram represents the exchange of gases during breathing and during respiration in the body, with structures X and Y. Oxygen enters and carbon dioxide leaves, with oxygen and…
Answer this question and get it marked →May–June 2023, Paper 21
During inspiration, the processes listed take place. P volume of the thorax increases Q air rushes into the lungs R pressure in the thorax decreases S external intercostal muscles…
Answer this question and get it marked →May–June 2023, Paper 22
Different stages in the process of expiration are listed. 1 Rib cage moves downwards and inwards. 2 Volume of thorax decreases and pressure in lungs increases. 3 Air is pushed out…
Answer this question and get it marked →May–June 2023, Paper 41
Fig. 3.1 is a photomicrograph of some cells lining the trachea, including a goblet cell and the cell labelled X (ciliated cell). Describe the role of goblet cells.
Answer this question and get it marked →October–November 2023, Paper 12
Which process causes oxygen to pass from an alveolus in the lung into a blood capillary? A assimilation B diffusion C excretion D osmosis
Answer this question and get it marked →What is the composition of expired air compared with inspired air? Columns: carbon dioxide; oxygen; water vapour. A decreased; increased; increased B decreased; decreased;…
Answer this question and get it marked →The diagram shows the human breathing system with structures labelled 1, 2 and 3. What are the labelled structures? Columns: 1; 2; 3. A bronchus; bronchiole; trachea B bronchiole;…
Answer this question and get it marked →October–November 2023, Paper 22
What is the composition of expired air compared with inspired air? Columns: carbon dioxide; oxygen; water vapour. A decreased; increased; increased B decreased; decreased;…
Answer this question and get it marked →During exercise, receptors detect a change in the blood and cause the breathing rate to increase. Which change do the receptors detect and where are they found in the body?…
Answer this question and get it marked →Other IGCSE Biology topics
- Human nutrition (75)
- Organisms and their environment (64)
- Coordination and response (62)
- Reproduction (53)
- Organisation of the organism (cells) (50)
- Plant nutrition (42)
- Characteristics and classification of living organisms (40)
- Variation and selection (40)
- Transport in animals (39)
- Inheritance (39)
- Movement into and out of cells (38)
- Transport in plants (38)