Our body cools, blood vessels constrict to conserve warmth, and we feel compelled to don more clothing or seek a warmer environment. This cooling response is an example of a:

The cooling response you described, where blood vessels constrict to conserve warmth and prompts the desire to don more clothing or seek a warmer environment, is an example of thermoregulation.

• Thermoregulation refers to the body's ability to maintain its core temperature within a narrow, optimal range. In the case you mentioned, when the body senses a drop in temperature, it initiates physiological responses to conserve heat.
• Blood vessels constrict (a process known as vasoconstriction) to reduce heat loss from the skin's surface, which helps retain warmth within the body. Simultaneously, the body may trigger behavioral responses, such as seeking shelter or adding more clothing layers, to further minimize heat loss and maintain a comfortable internal temperature. This overall response is part of the body's thermoregulatory mechanisms aimed at maintaining homeostasis in response to changes in environmental temperature.