When tiny blood vessels, called capillaries, absorb oxygen from the lungs and in turn discharge carbon dioxide, which we then exhale these blood vessels feed into the heart, which pumps the oxygenated blood to all cells and give off oxygen plus other nutrients and in turn receive waste products. The blood vessels that supply cells with nutrients and oxygen are called arteries, while the blood vessels that carry away waste products and carbon dioxide are called veins. The human heart is the vital organ that maintains the blood circulation of cardiovascular system.
It is a condition when the chest pain occurs under different moments like exertion, severe emotional stress, heavy meals or vigorous exercise during which the heart muscles demands more blood oxygen than the partial blockage of coronary arteries can deliver due to the narrowing or partial blockage of coronary arteries. Angina is only the symptoms of atherosclerosis and the sign of the heart attack.
Hearth attack (also known as a myocardial infarction) is the death of heart muscle from the sudden blockage of a coronary artery by a blood clot. Blockage of a coronary artery deprives the heart muscle of blood and oxygen, causing injury to the heart muscles. Injury to the heart muscle causes chest pain and chest pressure sensation. If blood flow is not restored to the heart muscle within 20 to 40 minutes, irreversible death of the heart muscle will begin to occur.
Causes of heart disease
- Atherosclerosis, thrombosis and arteriosclerosis
- High blood pressure
- High blood lipid which refers to increased levels of lipid (fat) I the blood, including cholesterol and triglycerides
- High level of homocysteine
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