View full lesson: http://ed.ted.com/lessons/what-happens-when-you-get-heat-stroke-douglas-j-casa

Have you ever suffered from exertional heat stroke? This condition is caused by intense activity in the heat and is one of the top three killers of athletes and soldiers in training. Douglas J. Casa explains heat stroke's tremendous effects on the human body and details an action plan in case it ever happens to someone you know.

Lesson by Douglas J. Casa, animation by Cinematic.