What happens during a stroke?

Every two seconds, someone in the world has a stroke. One out of every six people will have a stroke at some point in their lives. Strokes deprive brain cells of oxygen and are one of the most common causes of death, and a leading cause of preventable disability. But what causes strokes in the first place? And what can doctors do to treat them?
Lesson by Vaibhav Goswami, animation by Artrake Studio.

[Via: ed.ted.com]

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