Explanation:

Coronary heart disease is also called ischaemic heart disease. Coronary heart disease (CHD) is when the coronary arteries inside the heart become blocked due to a build-up of fatty substances. This hinders the flow of blood to the heart, making it deficient in oxygen.

There are various ways in which the arteries can become furred with fatty substances. Factors that increase risk include high blood pressure, diabetes, smoking, high cholesterol, obesity, family history of CHD and lack of exercise.