Scientists tested a stem cell treatment on patients whose hearts had been damaged by a heart attack.
The stem cells were taken from each patient's own bone marrow.
The Table shows the results.
Table
| Group | Number of patients | Mean increase in volume of blood pumped per beat in % | Number of patients who developed an abnormal growth |
|---|---|---|---|
| given stem cells | 120 | 8 | 6 |
| not given stem cells | 120 | 2 | 0 |
Calculate the percentage of patients given stem cells who developed an abnormal growth.
Describe the effect of the stem cell treatment on the volume of blood pumped per beat. Use data from the Table in your answer.
Explain why the stem cells were taken from each patient's own bone marrow.
Suggest why some patients given stem cells developed an abnormal growth.
46 exam-style questions on Edexcel GCSE Biology 2.2 Stem cells, covering 2.2.1 Function of stem cells and meristems and 2.2.2 Benefits and risks of stem cells. Each one has a worked solution and a mark scheme showing where the marks go.