Modern surgery has development almost incredibly.The development are numerous and wonderful. Now demage blood -vessels can be replaced with plastic substitutes. Damaged heart valves can be replaced with plastic substitutes.Tissues such as the lens of the eye can be transplanted by surgery. To clean the blood of poisons,artificial kidney has been invented. During very long operations patients can be kept alive by the newly developed heart and lung machines. In the area of organ transplants, modern surgery has achieved revolution. Until a few years ago no person was able to accept the tissue of another person.He usually reacted against them and he was eventually killed by them.Recently it has been discovered That it is possible to graft tissues from one person to another with the use of X-rays and special drugs,have been reasonably successful in animals. Human heart,of course Can be safely opened and it’s valves can be repaired. Modern surgery has made many impossible thins possible.