About 50% liquid, blood has many types of cells and proteins suspended in it. Blood is truly "thicker than water".
• Red blood cells carry oxygen to the tissues
• White blood cells fight infections
• Platelets help blood to clot
A blood cell can zip though the body in under 20 seconds. Our circulatory system is a speedway.
Blood travels around 60,000 miles every day, that's more than 2 1/2 times around the equator!
The average red blood cell survives for about 4 months, while white blood cells can live a year!
There are 2.5 trillion (give or take) of red blood cells in your body at any given moment.
Your bone marrow produces about two and a half million new red blood cells every second.
Blood makes up about 7% of your body weight.