Blood Components and Functions
IGCSE Edexcel Biology
2.59-2.61 Blood
Key Concept:
Blood contains plasma and cells that transport substances and protect against disease.
Section A: Components
1. Name the four main components of blood.
[4]
Section B: Functions
2. State three substances carried by plasma.
[3]
3. Describe three adaptations of red blood cells for oxygen transport.
[3]
Total marks: 10
Mark Scheme
1.
Red blood cells, white blood cells, platelets, plasma [4]
2.
Any three: carbon dioxide, digested food, urea, hormones, heat [3]
3.
Biconcave shape, no nucleus, packed with haemoglobin (any three) [3]