How does the heart work?

There is a killer that stalks our homes targeting smokers, the overweight and the sedentary. It has a preference for middle aged and older human beings. It is the heart attack. Coronary heart disease, including the heart attack is the leading cause of death in America .
 

How does the heart work?

The heart is a muscular pump which transports blood throughout the body. To transport blood the heart needs a constant supply of energy which it obtains from glucose and oxygen in the blood. The heart has a left and right side, separated by a wall. The left side of the heart is responsible for pumping oxygenated blood which has collected in the left atrium around your body via the left ventricle and the right side of the heart collects the blood on its return from its journey around the body, pumps the blood into the lungs for oxygenation and then returns the blood to the left atrium for pumping around the body. The coronary artery is the main artery from the heart and sends blood throughout the body; it is approximately the width of a hosepipe.

Heart attack

A heart attack (myocardial infarction) occurs when a blood clot (coronary thrombosis or coronary occlusion) forms in the coronary artery and blocks the flow of blood and oxygen to the heart. The oxygen starved heart muscle is then damaged and unable to act as an efficient pump.

Heart attacks predominately occur in people who have coronary artery disease. Coronary artery disease results in narrowing of the arteries through the formation of plaque. When arteries are narrowed by plaque, it makes it difficult for blood to travel through the arteries and if a blood clot forms at the narrowed point, it can block the artery and cause a heart attack.