When your body is too hot, a process called __________ occurs. When your body is too cold, a process called __________ occurs.

A) vasoconstriction; vasodilation
B) vasodilation; vasoconstriction
C) piloerection; hyperventilation
D) hyperventilation; piloerection

When your body is too hot, the body's blood vessels dilate, allowing blood to flow closer to the surface of the skin, where it can cool down. This process is known as vasodilation.
When your body is too cold, the blood vessels constrict, reducing blood flow to the surface of the skin in order to retain heat. This process is known as vasoconstriction.