Facts about the blood system

The first thing you need to know about the blood system is that it scientific name is circulatory system.

• A persons heart beats about 3 billion times in there life.

• Within a tiny droplet of blood, there are some 5 million red blood cells.

• It takes about 20 seconds for a red blood cell to circle the whole body.

• Red blood cells make approximately 250,000 round trips of the body before returning to the bone marrow, where they were born, to die.

• Red blood cells may live for about 4 months circulating throughout the body, feeding the 60 trillion other body cells.

• About 8 million blood cells die in the human body every second but the same number are born each second.

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Image from wikipedia