Vasodilatation of superficial blood vessels on the cheeks illustrates which skin function?

Vasodilatation of superficial blood vessels in the cheeks directly illustrates the skin's function in the regulation of body temperature. When blood vessels dilate, it increases blood flow to the skin's surface, facilitating heat loss. This is especially important when the body becomes too warm, allowing heat to dissipate through the skin and ultimately helping to maintain a stable internal temperature.

The skin acts as an organ of thermoregulation, and in response to heat stimuli, the vascular system contributes by increasing blood flow, which not only cools the skin but also aids in thermoregulatory processes such as sweating. Other options like protection, absorption, and sensation detection pertain to different skin functions but do not directly involve the mechanism of vasodilatation and its role in temperature regulation.