Edexcel IGCSE Biology · Spec 2.59-2.61
The Blood
The four components of blood and their jobs, and how red blood cells are adapted to carry oxygen.
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The Blood
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Spec 2.59-2.61
What you need to know
- Name the four components of blood
- Explain how red blood cells are adapted to their job
- State the jobs of white blood cells, platelets and plasma
Active recall
Quick check
Answer each question before opening the answer.
Name the four components of blood and one role of each.
Red blood cells — carry oxygen; white blood cells — defence against pathogens; platelets — clotting; plasma — transports dissolved substances.
Give two adaptations of a red blood cell.
Biconcave shape (large surface area), no nucleus (more room), full of haemoglobin to carry oxygen.
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