It's basically a way of sucking up to someone and it's almost as annoying and shallow as when girls post shit like omg stop being so perf! and then of course the required response is no that's you bb ð and it goes back and forth like that.
Temperature receptors. The sensory system involved in perceiving the changes in skin temperature begins with free nerve endings found in the dermal and epidermal layers of skin that can be functionally classified as cold and warm thermoreceptors.
It also works with the excretory system because it consists of glands that get rid of harmful wastes in the body. The circulatory system is the transport system for endocrine information, so it works with the circulatory system a lot as well.