It’s red and you need it. That’s what most people know about one of the most important substance in the world. Your blood keeps you alive and without it, nothing in your body could get to where it needs to be. Blood brings oxygen to your cells and removes waste products (functions you simply can’t live without). But there is more to blood than meets the eye. Did you know that most of your blood consists of water? In spite of this, however, there is no way to create blood artificially. It is completely up to our body to create it. In fact, red blood cells start their life in your bones (well, your bone marrow to be exact). After mutating for seven days they are released into your blood stream to begin their important duties. Thanks to the relentless pumping of your heart, each blood cell will now make a complete cycle through your body in just about 30 seconds. Each red blood cell will continue to circulate for over 100 days before it dies, and is replaced by a new red blood cell. Isn’t amazing how your body works together to sustain you? These are 25 Crazy Things You Might Not Know About Blood. If you want to know more about how your body works, take a look at these 25 amazing facts about the human body you may not be aware of - http://list25.com/25-unbelievable-facts-human-body/

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Blood is a lot more interesting than you know:

Your body has over 160,000 km (100,000 miles) of blood vessels. which if laid end to end, would stretch 2 and a half times around the Earth.

There are four main blood cell types, A, B, AB, and O. Each can be positive or Negative. AB is the Universal recipient while O negative is the universal donor.

In an average life time the human heart pumps 1.5 million barrels of blood (that's enough to fill 200 train tank cars).

One unit of blood can be separated into several components: red blood cells, plasma, platelets and cryoprecipitate.

Pregnant women have roughly 50% more blood by week 20 of pregnancy than they did before conception

In emergencies, coconut water can be used as a substitute for blood plasma.

A blood cell can make a complete circuit of your body in less than 30 seconds.

There are about .2 mg of gold in your blood stream

Your blood accounts for 8% of your body weight

Mosquitoes prefer people with blood type "O"

Every year, the average meat eating American ingests enough blood to fill a can of soda

Those strange bright white dots you see floating around when you look at the sky are white blood cells (it's called blue field entoptic phenomenon)

George Washington was bled to death by doctors. This is because bloodletting was a common practice back then. It was supposed to get rid of "bad blood"

A newborn baby has about one cup of blood in his body

and more...