Aplastic anaemia is a medical condition where the body stops producing enough new blood cells. This condition causes a decrease in red blood cells, white blood cells, and platelets.
Write down one possible symptom of aplastic anaemia that is caused by a decrease in red blood cells.
The table below shows blood component ranges in healthy individuals without aplastic anaemia.
| Blood component | Number per mm3\text{mm}^3mm3 |
|---|---|
| Red blood cell | 4.0 million−5.5 million4.0\text{ million} - 5.5\text{ million}4.0 million−5.5 million |
| White blood cell | 4.5 thousand−11.0 thousand4.5\text{ thousand} - 11.0\text{ thousand}4.5 thousand−11.0 thousand |
| Platelet | 150 thousand−450 thousand150\text{ thousand} - 450\text{ thousand}150 thousand−450 thousand |
A student examines a patient's blood sample under a microscope. The volume of blood under the slide is 0.02 mm3 and it contains 2400 platelets.
Calculate the number of platelets per mm3\text{mm}^3mm3 of blood.
Does this blood sample provide evidence that the patient has aplastic anaemia?
Use the table and your answer to part (b)(i) to justify your answer.
82 exam-style questions on OCR GCSE Biology 2.1 Supplying the cell, covering 2.1.1 Transport across cell membranes, 2.1.2 Mitosis and the cell cycle, 2.1.3 Importance of cell differentiation, and 2.1.4 Stem cells. Each one has a worked solution and a mark scheme showing where the marks go.