A person cuts their finger. Bacteria enter the cut.
The Table shows the numbers of different blood cells in 1 mm3 of the person's blood.
Table
| Type of blood cell | Number in 1 mm3 of blood |
|---|---|
| red blood cells | 5 000 0005\,000\,0005000000 |
| white blood cells | 7 5007\,5007500 |
| platelets | 300 000300\,000300000 |
Calculate the number of red blood cells for every white blood cell in this blood.
Give your answer to the nearest whole number.
Explain how platelets help to protect the body after the cut.
Describe how lymphocytes help to destroy the bacteria.
Two days later, a blood test showed that the person had more white blood cells than normal.
Suggest why.
42 exam-style questions on Edexcel GCSE Biology 8.2 Blood and circulation, covering 8.2.1 Structure and function of the blood, 8.2.2 Structure of blood vessels, 8.2.3 Structure of the heart and circulatory system, and 8.2.4 Cardiac output. Each one has a worked solution and a mark scheme showing where the marks go.