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Coronary Heart Disease. Coronary heart disease (CHD), also called coronary artery disease, occurs when plaque builds up in the coronary arteries. These arteries supply oxygen-rich blood to your heart. Plaque narrows the coronary arteries and reduces blood flow to your heart muscle. Plaque buildup also makes it more likely that blood clots will form in your arteries. Blood clots can partially or completely block blood flow.
ANSWER: Arteries usually carry oxygenated blood from heart to all the parts of the body whereas a coronary artery carries oxygenated blood and supplies it to the heart muscle-myocardium (for its functioning!) and that's where usually angina results as a result of artery thickening.