A patient has surgery to remove a malignant tumour. One day later, samples from the patient are tested.
| Sample tested | Malignant tumour cells detected |
|---|---|
| Blood | No |
| Lymph | Yes |
Use the results to explain why the patient could still develop secondary tumours in other parts of the body.
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.