Nikolas
Created page with "Activating the immune system eventually causes an inflammatory reaction, but how is it activated? Pathogens enters the body through an epithelial surface and are then taken up by blood or lymph. If taken up by blood, the blood will eventually reach the spleen, where erythrocytes meet leukocytes, so the leukocytes can recognize an antigen on the pathogen to start the immune reaction. If the pathogen is taken up by lymph, it will travel to a secondary lymphoid organ, most..."