The main cause of death and disability in the US

Stroke （中风）is the main cause of death and disability in the United States. Every 45 seconds, someone in America has a stroke. 36 It is the nation's third leading cause of death, ranking behind diseases of the heart and all forms of cancer. The following is something more about stroke www.dearedu.com .

Definition and description of a stroke

Stroke is a type of cardiovascular disease. It affects the arteries(动脉) leading to and within the brain. A stroke occurs when a blood vessel（血管） that carries oxygen and nutrients to the brain is either blocked by a clot or bursts. 37 . So stroke forms.

38　The American Stroke Association has identified several factors (因素) that increase the risk of stroke. The more risk factors a person has, the greater the chance that he or she will have a stroke. Some of these you can't www.dearedu.com control, such as increasing age, family health history, race, and previous stroke. 39 . Factors resulting from lifestyle or environment can be improved with a healthcare provider's help.

Breakthroughs in treatment 40 .In fact, about 600,000 people have strokes every year. For many years, there was no hopwww.dearedu.come for those suffering a stroke. However, recent breakthroughs have led to new treatments. For the treatments to work, the person must get to a hospital immediately.

A. Risk factors of a stroke.B .Warning signs of a stroke. 　

C. Every 3.1 minutes, someone dies of one.　

D. A stroke can happen to anyone at any moment.

E. But you can change or treat other risk factors to lower your risk.

F. When that happens, part of the brain cannot get the blood and oxygen it needs.

G .The more common kind of stroke is caused by a blood clot that blocks a blood vessel in the brain.

36-40 CFAED

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