A network of vessels, tissues, and organs in vertebrate animals that helps the body regulate fluid balance and fight against disease. The vessels of the lymphatic system drain excess fluid (called lymph) from the tissues and return it to the circulating blood. Lymphocytes circulate throughout the lymphatic system. A network of vessels that return lymph from body tissues to blood and filter out harmful particles on the way.
HIV infects cells in the central nervous system and the immune system. HIV's main target cell is the T helper lymphocyte. These cells play a crucial role in the immune system, by coordinating the actions of other immune system cells.A large reduction in the number of T helper cells seriously weakens the immune system.he Human Immunodeficiency Virus (HIV) seems to only infect the CD4 (or T-helper) cells of the immune system. The CD4 cells are responsible for activating and directing other â¦ immune system cells.
While studying how the coxsackie virus interacts with the immune system to cause heart disease, scientists recently discovered a paradox: The more the immune system is activated to resist the virus, the more the virus multiplies. Once it enters the body, the immune system tries to defend against it by producing white blood cells. But those cells can actually help the virus. âThe virus travels in the body and targets the heart by riding with the white blood cells,â says Liu. âThis has been nicknamed the Trojan Horse scenario.â