A person's gums bleed for much longer than usual after they brush their teeth. A doctor arranges a blood test.
The table shows the results.
| Component of the blood | Person's result (number per mm³) | Normal range (number per mm³) |
|---|---|---|
| Red blood cells | 4 900 000 | 4 500 000 to 5 500 000 |
| White blood cells | 7 000 | 4 000 to 11 000 |
| Platelets | 45 000 | 150 000 to 400 000 |
Use the results to explain why the person's gums bleed for longer than usual.
181 exam-style questions on OCR GCSE Biology 6.3 Monitoring and maintaining health, covering 6.3.1 Health and disease, 6.3.2 Interactions between diseases, 6.3.3 Spread of communicable diseases, 6.3.4 Common infections and diseases, 6.3.5 Physical plant defence responses, 6.3.6 Chemical plant defence responses, 6.3.7 Detecting and identifying plant diseases, 6.3.8 White blood cells and platelets, 6.3.9 Non-specific defence systems, 6.3.10 The immune system, 6.3.11 Monoclonal antibodies, 6.3.12 Vaccines and medicines, 6.3.13 Aseptic techniques, 6.3.14 Discovery and development of new medicines, 6.3.15 Causes of non-communicable diseases, 6.3.16 Treatments for cardiovascular disease, 6.3.17 Lifestyle factors and non-communicable diseases, 6.3.18 Cancer, 6.3.19 Stem cells in medicine, 6.3.20 Gene technology in medicine, and 6.3.21 The human genome and medicine. Each one has a worked solution and a mark scheme showing where the marks go.