Why is wheatgrass called green blood?

 Why is wheatgrass called green blood?
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Wheatgrass is commonly known as “Green Blood” due to its high content of chlorophyll, which accounts for 70% of the chemical composition and chlorophyll has a similar structural formula to heme, a substance used by the body in The formation of hemoglobin in red blood cells as well.
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Thanks for the source...
Herbal Information Office Faculty of Pharmacy Mahidol University
Padalia S, Drabu S, Raheja I, Gupta A, Dhamija M. Multitude potential of wheatgrass juice (Green Blood): An overview. Chronicles of Young Scientists1(2) 2010 :23-28.