Question
Question 3 (4 marks)
State two lifestyle risk factors for coronary heart disease and explain how each increases the risk.
Mark scheme (B1, 4 marks — 2 per factor):
- Smoking: nicotine raises blood pressure, increasing stress on artery walls / carbon monoxide reduces blood O₂ / chemicals damage artery lining, promoting plaque build-up (2 marks)
- Diet high in saturated fat: raises blood cholesterol levels / cholesterol is deposited in artery walls as atheroma / narrows coronary arteries → restricts blood flow to heart muscle (2 marks)
- Accept: obesity / lack of exercise / high blood pressure — with appropriate explanation
4 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.