Additional Links
Overview of Shock: Causes, Symptoms, and Treatment:
http://www.emedicinehealth.com/shock/article_em.htm#shock_overview
Read about what happens in a blood bank:
https://www.medicinenet.com/blood_transfusion/article.htm
More cool stuff about skin grafts:
http://health.howstuffworks.com/skin-care/information/anatomy/skin-graft.htm