Answer
The blood vessels of the dermis help regulate the body temperature by enlarging and narrowing, which decrease and increase body temperature.
Work Step by Step
The blood vessels of the dermis (layer of fibrous and elastic tissue made mostly of collagen) provide nutrients to the skin and help regulate the body temperature. Heat makes the blood vessels enlarge, allowing larger amounts of blood to circulate near the skin surface, where the heat can be released. The cold makes the blood vessels narrow, retaining the body's heat.
