Another reason our bodies have color is because of the blood under our skin. Some parts of our bodies, like our lips and our tongues, don't have much pigment so it's the blood running through them that gives them color. In the case of our tongues, the blood that travels through it to fuel its many muscles makes it pink!
ExplorationThe Tongue: A Terrific Tool!
Think of all the things your tongue can do. It can taste. It helps you talk. Try saying any of these words without moving your tongue: tongue, terrific, tool, talk, taste.
Tongues also help us clean our teeth (though they are no substitute for a good brushing!)
To do all those things, tongues need a lot of blood for muscle fuel. In a mirror, stick out your tongue and look at the bottom of it. You'll be able to see some of those blood vessels that deliver blood to your tongue and give it its pink color!
Sources & links
"tongue." Encyclopædia Britannica. 2010. Encyclopædia Britannica Online. 06 Jul. 2010. Welsh, Wallace, DeGruy. "The Truth About those Black Tongues." Chow Chow Welfare. Online. 06 Jul. 2010. "pigment." Merriam-Webster Online Dictionary. 2010.