A student measured her breathing rate and the volume of air she breathed in with each breath. She took the measurements at rest and then during exercise.
Table: The breathing rate and the volume of air breathed in per breath for one student at rest and during exercise
| Condition | Breathing rate in breaths per minute | Volume of air per breath in cm3 |
|---|---|---|
| At rest | 12 | 500 |
| During exercise | 30 | 1800 |
Calculate how many times greater the volume of air the student breathes in each minute is during exercise than at rest.
Explain why the volume of air breathed in each minute increases during exercise.
179 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.