3.3.24

Heart Disease

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Coronary Heart Disease

Coronary heart disease is when the coronary arteries become more narrow because of a build-up of fatty deposits. This reduces blood flow and leads to a lack of oxygen being supplied to the heart muscle.

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Tunnel

  • Imagine people carrying wood to a fire through a tunnel.
  • If the tunnel narrows, fewer people can fit through the tunnel.
  • This means that the fire will start to die out as less wood can reach it.
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Risk factors

  • Smoking, a lack of exercise, being overweight, a diet high in saturated fats, being male, being over 40 years old and having a genetic predisposition are all risk factors for coronary heart disease.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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