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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. | 
