How is heart disease hereditary?

Heredity: Inherited abnormal genes determine how your body handles dietary cholesterol and saturated fats leading to plaque build-up in coronary arteries in some families even though others with the same diet have no plaque formation. Also some genes lead to abnormal heart musculature causing cardiomyopathy. Some are more prone to cardiac arrhythmias or other abnormal heart structures due to heredity.