Final answer:
Constriction of skin blood vessels decreases heat loss from the body, which helps in regulating body temperature. This physiological process, known as vasoconstriction, redirects blood flow away from the skin to conserve heat.
Step-by-step explanation:
The constriction of skin blood vessels will decrease heat loss from the body, thereby helping return body temperature toward its original value. This process is known as vasoconstriction, which is a physiological response that reduces blood flow to the surface of the skin. When the body is exposed to low temperatures, this mechanism acts to conserve heat by redirecting blood flow away from the skin and towards the core, where vital organs are located. Conversely, during strenuous physical activities like skiing or running, the body cools itself down through vasodilation (dilation of blood vessels) and increased sweat production, which allows more blood flow to the skin's surface and promotes heat loss through radiation and evaporation.