Take a good look at your hands and wrists. Do you see lots of bluish lines that look like a maze under your skin? Those lines are veins that are sending your blood through your body. Most of us don’t think about our blood very often, unless we get cut and see it oozing out. But blood is one of the most amazing substances in the world. Let’s see why blood is so great.

Your body is composed of cells that do all kinds of different jobs. Your brain cells help you think, your skin cells protect your body, bone cells give your body support, and hundreds of other kinds of cells work hard to keep you healthy. But all of these cells need energy. And many of the cells make “garbage” or waste products that need to be carried away. How does your body supply all of its cells with what they need? That is where blood fits in. The veins and arteries in your body are tiny tubes that God designed to transport blood. They are like pipes in your house that send water to your faucets. Except you have a lot more blood vessels than your house has pipes. In fact, you have over 50,000 miles of blood vessels in your body.

The blood that goes through those vessels is extremely important. It makes up about 8% of your total body weight. You have about 1.3 gallons of blood, or 5.3 quarts. Your blood is made up of two main parts. One part is made up of cells: mostly red blood cells, white blood cells, and platelets. Jeff Miller has written an article in this month’s Discovery that discusses God’s amazing design that we see in platelets and blood clotting. Blood cells make up about 45% of your blood. The other 55% of blood is called plasma. Plasma is mostly water (about 90%), but it does contain other things like salt, protein, and sugars….

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