Red blood cells last for 120 days and there are 2.5 trillion of them at one moment. To maintain this number 2 million red blood cells have to be made every second by your bone marrow. A red blood cell can circulate around your entire body in 20 seconds.
The blood is so important for in it contains life for the body..
Tempus Domini - life
The Lord's day - He who gave us life- man was made on the sixth day. Be thankful for things that God has given us.