Why is blood is sometimes called "the river of life"?

Blood is liquid and red, just like a red river. And for humans without blood there is no life because there is nothing to transport nutrients and oxygen to the body cells. Hence blood is the red river of life.

i think its because of how the blood is one of the main reasons we are alive today. And without it we'd die

well in order to answer this question you have to provide more information < 3

diaria maybe go see a doctor about that