Heart attack
Plaque (which is formed by fat, calcium, and wandering cells) with varying sizes attached to the walls of arteries. Many of the plaques that a hard exterior and soft interior. Plaque narrows the arteries and increases rapidly.
When the plaque is complex, the outer skin will rupture (cracked or torn), platelets (blood cells that play a role in blood clotting) come to the area, and blood clots form in the plaque cracks or tears.
Blood clots that form will block blood flow in arteries in case of total blockage secret the heart muscle become "starved" for oxygen and nutrients (called ischemia) in the area below the blockage. In short, there is the death of heart muscle cells, causing permanent damage. This is called a myocardial infarction (MI) or heart attack.
Heart attacks can also occur less frequently because of coronary artery spasm. During a coronary spasm, coronary arteries constrict or spasm on and off, which causes a lack of blood supply to the heart muscle (ischemia). This can occur at rest and can occur even in people without significant coronary artery disease. If a coronary artery spasm occurs over a prolonged period, a heart attack can occur.
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