How do skin blood vessels respond to hot weather according to Claude Bernard’s research?

According to the research of French physiologist Claude Bernard, the vasomotor nerves play a critical role in regulating the body's internal environment by controlling the dilation and constriction of blood vessels in response to environmental temperature changes.1

In hot weather, Bernard discovered that these blood vessels expand (dilate) to increase blood flow to the skin, which allows the body to dissipate excess heat. This mechanism is a fundamental aspect of homeostasis, the process by which an organism maintains a stable internal state despite fluctuating external conditions.12