Immune System

The immune system fights dideases with several complex defenses. For pathogens to have any danger they have to go through the first line of defense. Many organisma that enter you mouth go through the digestive systme quikly, and any that go through your nose go down with mucus. The outer part of your skin is dead. That makes it hard for the viruses to get into you. Then when yor skin flakes off it takes the viruses and pathogens with it. When your skin is cut then the pathogens get through easier but then the platelets close the seal up, so that they can keep as little as possible pathogens out. The flow of the bloodstream brings cells from the immune system. The immune system is what fights off diseases. the immune system is not controlled by anything. It is just tissues and cells. Macrophages is a cell that engulfs many microorganisms. If only a few enter it is easier to fight off. T cells coordinate the immune system and attack infected cells. B cells is the part of the immune system that makes the antibodies. Antibodies are proteins that attach to specific antigens. When the virus enters it replicates, and that is when the immune system really starts working. it is easier to fight off diseases with the menory B cells. Memory B cells are cells in the immune system that remebers the virus so knows how to work with it.