How do vasomotor nerves control blood vessels?

Claude Bernard, a pioneering French physiologist, discovered that vasomotor nerves regulate the blood supply by controlling the dilation and constriction of blood vessels in response to environmental temperature changes.12

This mechanism serves as a vital component of homeostasis, allowing the body to maintain a stable internal environment despite fluctuating external conditions. For example, in cold weather, these nerves trigger the constriction of skin blood vessels to conserve body heat, while in hot weather, they cause the vessels to expand to dissipate excess heat.12

By regulating the internal diameter of these vessels, vasomotor nerves effectively control the volume of blood passing to specific organs or body parts. This process is part of a broader system of circulatory regulation that ensures the body meets its physiological needs, working in tandem with other factors like hormones and sensory receptors that monitor blood pressure and volume.3456