Final answer:
Vasodilation is used by the body to help prevent heat stroke, a critical emergency situation due to prolonged exposure to high temperatures.
Step-by-step explanation:
Vasodilation is the process in which the blood vessels in the skin dilate, allowing more blood from the warm body core to flow close to the surface of the body. This helps with the transfer of heat from the body into the environment. Vasodilation is used by the body to help prevent heat stroke, which is a critical emergency situation that can occur due to prolonged exposure to high temperatures.