Encrine sweat glands are located under the skin and are responsible for the secretion of sweat. Instead, the hair on our skin prevents heat from being trapped by a layer of still air due to the relaxation of the arrector pili muscles under the skin. This will only occur if the ambient temperature is higher than the core body temperature as a response to heat loss and therefore cooling of the body. Even in these conditions the human body undergoes so-called arteriolar vasodilation. Arteriolar vasodilation occurs when the cell walls of the arteries are relaxed compared to cold conditions when they are constricted. As a result of the relaxation of cell walls, blood flow around the body also increases, redirecting blood through surface capillaries where convention and conduction occurs to reduce body temperature. Conversely, when the body experiences cold conditions, we can assume that the opposite would happen in warm conditions. An example of this assumption is that in hot conditions when you sweat a lot, in cold conditions your sweat production decreases. Another example is that the arrector pili muscles under the skin relax in warm conditions while, as in cold conditions, they contract, causing the hair follicle to stand upright. Consequently a