Your blood courses through your body carrying nutrients, oxygen and other biological important substances. And this delivery system also brings heat produced in the muscles to the skin, where it's released.
When you enter a cold environment, your body redistributes blood to the torso, protecting and maintaining the warmth of the vital organs there. At the same time, your body constricts blood flow to the skin. Narrowing the roads to the skin means less heat can make the journey, and so less is lost to the environment. And minimizing how much blood goes to the skin – which is in closest proximity to the cold – means you can hold onto more of your internal heat longer.
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Answer:
Your blood courses through your body carrying nutrients, oxygen and other biological important substances. And this delivery system also brings heat produced in the muscles to the skin, where it's released.
When you enter a cold environment, your body redistributes blood to the torso, protecting and maintaining the warmth of the vital organs there. At the same time, your body constricts blood flow to the skin. Narrowing the roads to the skin means less heat can make the journey, and so less is lost to the environment. And minimizing how much blood goes to the skin – which is in closest proximity to the cold – means you can hold onto more of your internal heat longer.