Britannica Educational Publishing 
Blood [PDF ebook] 

Although its ubiquity in the human body may make it seem unremarkable, simply put, blood makes life possible. It nourishes cells throughout the body and transports carbon dioxide to the lungs. Without it, the body would be unable to fight disease and infection or function at all. Readers are invited to follow the course of this extraordinary fluid as it circulates through the body and learn about its component parts. Detailed diagrams supplement the text and allow readers a glimpse into the anatomy and life sustaining properties of human blood.