The second way people die in high heat also has to do with your body pumping more blood to the skin. "And at that point, it's pretty irreversible," Jay adds. Those clots can lead to multiple organ failure. And the white blood cells are going to attack this contamination in the blood, creating coagulation" – or blood clots, Mora says. "They say, Oh my God, we're getting attacked right now. And that sets off a cascade of effects that ultimately result in death," Jay says.įor example, those toxins can activate white blood cells, says Camilo Mora, a climate scientist and professor at the University of Hawaii at Manoa who has researched how heat can turn fatal. "So, nasty things like endotoxins that usually reside and stay inside the gut start leaking out of the gut, entering the circulation. If these conditions go on long enough, your gut can become more permeable. But that means less blood and less oxygen are going to your gut. When your body is exposed to heat, it will try to cool itself down by redirecting more blood to the skin, says Ollie Jay, a professor of heat and health at the University of Sydney, where he directs the Heat and Health Research Incubator. But when it's very humid out, that sweat won't evaporate as well and cool you down. When the surrounding temperatures approach your internal body temperature – which is about 98.6 degrees Fahrenheit for most of us – your body starts to cool off through evaporative cooling, better known as sweating.
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