How could the skin respond when the human body is too cold?
A. Muscles in the skin cause the hair to stand up.
B. Blood flow to the skin increases.
C. The body begins shivering to produce heat.
D. Sweat is secreted on the surface of the skin.
A. Muscles in the skin cause the hair to stand up.In cold weather, skin hairs in both humans and animals stand up (called piloerection), which causes entrapment of the air in the hair web.
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