Blood - School.rar
The "soldiers" of the immune system that identify and fight off infections and foreign pathogens.
Responsible for carrying oxygen from the lungs to body tissues and returning carbon dioxide to be exhaled. Blood School.rar
The liquid base (about 55% of blood volume) that transports nutrients, hormones, and waste products throughout the body. The "soldiers" of the immune system that identify
Human blood is a specialized fluid tissue composed of four primary parts that make up roughly 7-8% of total body weight: Blood School.rar
Understanding blood types is a staple of middle and high school biology. Blood Basics - American Society of Hematology

This is helpful! Over the summer I will be working on a novel, and I already know there will be days where my creativity will be at a low, so I'll keep these techniques in mind for when that time comes. The idea of all fiction as metaphors is something I never thought of but rings true. I'll have to do more research into that aspect of metaphor! Also, what work does Eric and Marshall McLuhan talk specifically about metaphor? I'm curious...
I just read Byung-Chul Han's latest, "The Crisis of Narration." Definitely worth a look if you're interested in the subject, and a great intro to his work if you've not yet read him.