hemorrhage – n. a condition in which a person bleeds too much and cannot stop the flow of blood
artery – n. any one of the tubes that carry blood from the heart to all parts of the body
respirator – n. a medical device that helps people breathe
transplant – v. a medical operation in which an organ or other part is removed from the body of one person and put into the body of another person
unconscious – adj. not awake especially because of an injury, drug, etc.