Biology 9700 · 9 Gas exchange
9.1 The gas exchange system
Describe the structure, tissue distribution, and cellular functions of the human gas exchange system, and explain alveolar gas exchange.
- Questions
- 305
- Years
- 2002–2026
- Multiple choice
- 237
- Written answer
- 68
- Average marks
- 3.1
Where this subtopic appears
- Paper 1variants 01, 11, 12, 13, 14237
- Paper 2variants 02, 21, 22, 23, 2460
- Paper 3variants 03, 35, 364
- Paper 4variants 04, 422
- Paper 5variants 05, 522
Questions by year
| Year | Feb/March | May/June | Oct/Nov | Total |
|---|---|---|---|---|
| 2026 | 2 | 10 | – | 12 |
| 2025 | – | 5 | 7 | 12 |
| 2023 | 4 | 9 | 7 | 20 |
| 2022 | 4 | 13 | 4 | 21 |
| 2021 | 3 | 10 | 10 | 23 |
| 2020 | 4 | 13 | 11 | 28 |
| 2019 | 3 | 9 | 9 | 21 |
| 2018 | 3 | 10 | 11 | 24 |
| 2017 | 3 | 10 | 9 | 22 |
| 2016 | 4 | 14 | 10 | 28 |
| 2015 | – | 12 | 8 | 20 |
| 2011 | – | 10 | – | 10 |
| 2010 | – | 10 | 11 | 21 |
| 2009 | – | 3 | 6 | 9 |
| 2008 | – | 1 | 5 | 6 |
| 2007 | – | 1 | – | 1 |
| 2006 | – | 1 | 5 | 6 |
| 2005 | – | 4 | 3 | 7 |
| 2004 | – | 2 | 3 | 5 |
| 2003 | – | 5 | 3 | 8 |
| 2002 | – | – | 1 | 1 |
