Describe the role of blood vessels in the control of body temperature.

The control of body temperature as well as other factors such as blood CO2 concentration, or blood glucose concetration is part of a biological mechanism called homeostasis. 

Blood vessels have the ability to dilate and constrict to control body temperatre. 

When body temperature is too low, the tiny blood vessels near the surface of the skin (capillaries) constrict (vasoconscriction). This decreases the blood flow near the surface of the skin so less heat is lost through radiation.

When body temperature is too high, the capillaries dilate (vasodilation), which increases blood flow near the surface of the skin and so more heat is lost through radiation.

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