A heart attack occurs when there is a block of
flow of blood through the coronary artery which
then cannot get enough oxygen. The coronary
arteries becomes blocked from the buildup of
various substances, including cholesterol.
Heart attacks can also occur because of a spasm of
a coronary artery, which shuts down the flow of
blood to the heart muscle.
The condition called atherosclerosis is the
built up of waxy substances in the arteries and it
takes place over many years. When an area of this
plaque ruptures and goes inside the artery, it
causes a blood clot which ends blocking the blood
flow through the coronary artery.
Mayo Clinic site I took the following image
where you can
see why the heart attack occurs
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