Question 7(a)(i)
[Maximum number: 4]
Coronary heart disease (CHD) is caused by damage to the walls of the coronary artery.
Explain two differences between the structure of the wall of an artery and the wall of a vein.
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Edexcel IGCSE Biology 2.68 artery, vein and capillary structure
Practise comparing artery, vein and capillary wall structures, linking lumen size, muscle and elastic tissue to blood pressure and flow.
How this is tested
- compare artery and vein walls using elastic tissue, muscle thickness and lumen size
- explain how elastic fibres and thick walls help arteries withstand high blood pressure