During a lung-function test, a person breathes out. The volume of the person's thorax was measured at two stages.
| Stage | Volume of thorax |
|---|---|
| Beginning of breathing out | 6.4 dm³ |
| End of breathing out | 5.8 dm³ |
The pressure outside the body remains constant.
Explain why air leaves the lungs during the test, and predict what would happen to the direction of air movement if the volume of the thorax increased instead.
304 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.