Now, the skin can also expel heat via the endothermic process of evaporation. So sweating takes place and that rising heat basically vaporizes evaporates that water and endothermic process. And that's how we basically regulate the amount of energy in our body by using our heat. Now, at the same exact time when it's very cold outside, our skin can actually conserve heat. And how it conserves heat is it basically constricts our blood vessels found in the dermis and that redirects that shunts the blood away from the skin and that conserves energy because there is very little blood that actually radiates the energy out from our skin. So our skin cannot only dissipate that heat, but it can actually be used to store as much heat in the body as possible.