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.
The human T-cell lymphotropic viruses type I and type II (HTLV-I/II) are closely related but distinct retroviruses that can. infect humans. These viruses have nothing to do with HIV or AIDS. HTLV-I and HTLV-II viruses infect specific cells in the. body known as lymphocytes, a type of white blood cell. White blood cells are involved in the immune response and help. the body fight infection.