How does the skin help regulate body temperature?

The mechanism by which the skin regulates body temperature primarily involves the adjustment of blood flow and the production of sweat. When the body temperature rises, blood vessels in the skin dilate, allowing more blood to flow to the surface. This process, known as vasodilation, helps dissipate heat through the skin.

Simultaneously, sweat glands produce sweat, which is released onto the skin's surface. As sweat evaporates, it cools the skin and, as a result, the body. This dual response—modifying blood flow and sweat production—effectively helps maintain a stable internal body temperature despite changes in the environment or physical activity levels.

The other options do not play a significant role in temperature regulation. Increasing fat deposits can insulate the body but would not be an acute response for temperature control. Altering skin color does not inherently assist in thermoregulation. Lastly, shedding dead skin cells is a normal process of skin renewal and does not contribute to temperature regulation. Thus, the correct answer accurately reflects the skin's primary functions in maintaining body temperature.