Question

bio - 201 topic 3: the integument, skeleton, and articulations
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how does the skin help regulate body temperature?
by shivering to warm the body up and dilating blood vessels to keep the body cool.
by producing excess oil to cool the body down and reducing hair growth to keep the body warm.
by expanding blood vessels to cool the body down and sweating to keep the body warm.
by sweating to cool the body down and constricting blood vessels to keep the body warm.
by secreting pheromones to cool the body down and constricting blood vessels to keep the body warm.

Explanation:

When the body is warm, sweat glands in the skin secrete sweat which evaporates and cools the body. When the body is cold, blood vessels in the skin constrict to reduce heat loss and keep the body warm. Shivering is a muscle - related action for warming, not skin - specific. Oil production and hair growth are not primary temperature - regulating mechanisms. Pheromones are not involved in body temperature regulation.

Answer:

By sweating to cool the body down and constricting blood vessels to keep the body warm.