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Paper 4Theory (Extended)3 marks
The diagram shows the structure of an artery and a vein.
Diagram Description
Artery and Vein Structure
The artery has thick walls with a narrow lumen. The vein has thinner walls with a wider lumen and valves inside.
| Feature | Artery | Vein |
|---|---|---|
| Wall thickness | Thick | Thin |
| Lumen size | Narrow | Wide |
| Valves | Absent | Present |
- b[3]
Explain how the structure of veins is adapted to the blood pressure they carry.
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