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CAIE IGCSE Biology 9.2.5 Coronary Heart Disease

Practise explaining coronary artery blockage, reduced heart-muscle oxygen supply and modifiable or inherited risk factors.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • identify coronary arteries as the vessels supplying oxygen and glucose to cardiac muscle
  • explain how narrowing or blockage reduces oxygen delivery, aerobic respiration and heart contraction
  • classify diet, inactivity, stress and smoking as modifiable risks while recognising age, sex and genetics

9.2.5—Coronary heart disease in terms question 1

[Maximum number: 2]

Carbohydrates are an important component of a balanced diet.
The flow chart in Fig. 3.1 shows some of the processes that happen to carbohydrates in food that is eaten.

Fig. 3.1

Fig. 3.1

Consuming too much of some mineral salts, such as sodium chloride, increases the risk of developing coronary heart disease (CHD).

Doctors studied the effect of diet on the risk of developing CHD.
The doctors first selected volunteers who had a high salt diet.
The doctors assessed the volunteers' overall risk of developing CHD and monitored their blood pressure.

List two factors, other than diet and blood pressure, that the doctors considered when assessing the overall risk of the volunteers developing CHD.

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2

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