Final answer:
Hair, sweat glands, blood vessels, and nerves in the skin are structures that help to regulate body temperature.
Step-by-step explanation:
The structures in the skin that help regulate body temperature are:
Hair: While not directly involved in temperature regulation, hair can provide some insulation and help to trap heat close to the body.
Sweat glands: These glands produce sweat, which evaporates from the skin's surface and helps to cool the body down.
Blood vessels: When the body temperature rises, the blood vessels in the skin dilate (vasodilation), allowing more blood flow to the surface, which facilitates heat loss. When the body temperature drops, the blood vessels constrict (vasoconstriction) to minimize heat loss.
Nerves: Nerves in the skin help to detect changes in temperature and send signals to other parts of the body to initiate temperature-regulating responses.