Coronary Heart Disease - GCSE Biology Definition

Coronary Heart Disease (CHD) is a condition where the coronary arteries, which supply blood to the heart muscle, become narrowed or blocked. This happens because of a build-up of fatty substances, known as plaques, on the artery walls. These plaques make it harder for blood to flow through the arteries, reducing oxygen and nutrients that reach the heart. CHD can lead to chest pain, known as angina, and increase the risk of heart attacks. Risk factors include an unhealthy diet, lack of exercise, smoking, and high cholesterol levels. It's important to lead a healthy lifestyle to help prevent CHD.