Physiological mechanisms for heat dumping, such as sweating and vasodilation, are controlled by the autonomic nervous system.

“Some of those are purely physiological, below our conscious control, things like sweating, which you can't just make yourself sweat on demand. Maybe you can through a set of stressful thoughts, but you can't just make yourself sweat. That is autonomic, it's below your conscious control. Things like vasodilation, the dilation of your veins in particular and capillaries in particular. These sorts of things.”