Okay, I'm a little confused.
"I've got demon blood in me, Dean! This disease pumping through my veins, and I can't ever rip it out or scrub it clean! I'm a whole new level of freak!"
........................................................-Sam Winchester, Metamorphosis
As we all know, Azazel bled into baby Sam's mouth in order to make him one of his "special children". And that adult Sam drank Ruby's blood in order to be able to exorcise demons without killing the host. So, how does simply swallowing demon blood give him that ability? Wouldn't he have to have Ruby, and for that matter YED, bleed into an open wound of his, their blood mixing with his blood to make him part demon - as it were.
Because, correct me if I'm wrong but, when we swallow things, like food and water, doesn't it just...go through our digestive system? Esophogus, stomach, intestines, kidneys, bladder (or colon, sorry). Therefore, all that blood that Sam drank would just...go through his system? I mean, how does the Demon blood get into his blood just by swallowing it? Am I missing something?
This has been bugging me for a long time. Any insights into this would be greatly appreciated. Even if you just tell me how much of an idjit I am when it comes to this.