You should check if you friend have oral herpes aand if he does them go to the octor
The therapy is called Radiation Therapy. Its a treatment that kills abnormal cells or cancel cells by using radioactive ray such as gamma rays use it in killing the cancer cells in the body without harming any good cells that support the immune system of the body. This therapy also use any king of radioactive material in the treatment by placing it in the area that is near the cancer cells or a tumor.
Answer:With this system, blood always flows in only one direction inside the heart. There are also valves at the bottom of the large arteries that carry blood away from the heart: the aorta and the pulmonary artery. These valves keep the blood from flowing backward into the heart once it has been pumped out.
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