Gas exchange in humans — IGCSE Sciences - Co-Ordinated (0973) questions by topic
Gas exchange in humans questions compare oxygen and carbon dioxide percentages in inspired versus expired air, label structures in the breathing system diagram, describe composition changes between inspired and expired air, and identify the diaphragm among four labelled structures, worth from 1 to 12 marks.
Identify, explain, describe and calculate are the top command words in this IGCSE Co-ordinated Sciences topic: describe a percentage change between inspired and expired air using the correct direction, increase or decrease. 6 real questions from 2023 to 2025 papers make up this compact page. Submitting each answer for instant marking flags a labelled structure, such as the diaphragm, matched to the wrong letter before it happens twice.
May–June 2025, Paper 11
The diagram shows the human gas exchange system. Four structures are labelled A, B, C and D: A points to the right lung tissue, B to the rib region on the right side, C to the…
Answer this question and get it marked →May–June 2025, Paper 12
Which row shows the percentages for inspired air and expired air? inspired air oxygen / % inspired air carbon dioxide / % expired air oxygen / % expired air carbon dioxide / % ---…
Answer this question and get it marked →May–June 2025, Paper 42
Fig. 2.1 is a diagram of the human breathing system. The alveoli are labelled on the left side. Letters A-E label parts of the system: A points to the top of the central tube…
Answer this question and get it marked →May–June 2024, Paper 11
A person inflates a balloon by breathing into it. What is the composition of the air in the balloon? A oxygen 0.04%, carbon dioxide 21% B oxygen 4%, carbon dioxide 16% C oxygen…
Answer this question and get it marked →May–June 2024, Paper 12
Which statement about the composition of expired air, compared with inspired air, is correct? A The percentage of carbon dioxide is decreased and the percentage of water vapour is…
Answer this question and get it marked →May–June 2023, Paper 11
In the diagram of the human breathing system, which structures are correctly labelled? [Diagram: labels point to trachea, bronchiole, bronchus and alveoli.] A alveoli and…
Answer this question and get it marked →Other IGCSE Sciences - Co-Ordinated topics
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