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If a blood clot develops in one of these arteries, the blood supply to that area of the heart muscle will stop. This is known as a heart attack, or in medical terms a coronary thrombosis or myocardial infarction. A heart attack will cause severe chest pains behind the breast bone, often radiating towards the left arm.

The essential components of the human cardiovascular system are the heart, blood and blood vessels. It includes the pulmonary circulation, a "loop" through the lungs where blood is oxygenated; and the systemic circulation, a "loop" through the rest of the body to provide oxygenated blood.

A coronary angioplasty is a procedure used to widen blocked or narrowed coronary arteries (the main blood vessels supplying the heart). The term 'angioplasty' means using a balloon to stretch open a narrowed or blocked artery.

Blood flow is the continuous circulation of blood in the cardiovascular system. This process ensures the transportation of nutrients, hormones, metabolic wastes, O2 and CO2 throughout the body to maintain cell-level metabolism, the regulation of the pH, osmotic pressure and temperature of the whole body, and the protection from microbial and mechanical harms.

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