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Our blood is very important. It keeps us alive. We explore some of it's key functions.
One of the key functions of blood is protection. Did you know that, when fighting an infection, the body produces more white blood cells?
One of the key functions of blood is transport. Did you know it takes a red blood cell less than a minute to move from the heart, through the body, and back to the heart?
One of the key functions of blood is clotting. Did you know that platelets are small, about one third of the size of a red blood cell?