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But unlike snakes, we shed our skin gradually - it takes about 35 days for us to replace all of the skin on our body. The oldest skin cells are shed to make room for the younger ones that lie beneath them. When our skin is healthy and glowing, it's a thing of true beauty, so you might be surprised to learn that the epidermis - the layer that everybody gets to see - is actually composed of dead skin cells that are always sloughing off and spreading bits of your DNA all over the place. Now that you know why you should appreciate this special organ, let's find out what skin is made of. If it weren't for your skin and your nerves, you'd miss out on all the things that feel so good to the touch. Nerve endings in your skin send signals to the brain to communicate the sensations you're feeling: heat, cold, pain, pressure, texture. In addition to these vital jobs, skin provides us with the essential human experience of touch. When it's hot outside, the same blood vessels expand to encourage heat loss, and you begin to sweat. When it's cold outside, blood vessels contract to keep the blood near the surface of your skin from becoming too cool. Blood vessels in the skin contract and dilate depending upon the outside temperature so that our bodies remain near 98.6 degrees F (37 degrees Celsius).
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Skin also helps regulate your body temperature. Signals sent from your skin sound the alarm for your body's immune system to launch into action when germs have made entry.
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It's filled with white blood cells that are rigged to attack any invading harmful bacteria. Think of your skin as a protective covering that shields your body from germs. Besides keeping us nicely packaged, skin performs a host of important functions that are crucial for overall bodily health.