CAIE A Level Biology 9700 · Transport in mammals

Transport in mammals: describe question

Describe6 marksChallenge

Table 1 shows the blood cell counts from a healthy individual and from a patient suspected of having a bacterial infection.

Blood componentHealthy individual (cells per mm³)Patient (cells per mm³)
Red blood cells5.4 × 10⁶5.3 × 10⁶
Platelets250,000245,000
Total white blood cells7,00018,000
Neutrophils4,20013,500
Lymphocytes2,1002,500
Monocytes5001,200
Eosinophils150200
Basophils5060

Describe how the structure of the white blood cell type that shows the greatest increase in count in the patient's blood is adapted for its function. Also describe the process of tissue fluid formation, explaining the role of water in this process and in the transport functions of blood.

0 words · 6 marks

No account needed for your first marks. Your answer is used only to mark it.

How this question is marked

6 marks, so the mark scheme is looking for about 6 separate creditworthy points. Making the same point twice in different words earns it once.

Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.

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