The receptors match only one specific antigen. White blood cells called lymphocytes originate in the bone marrow but migrate to parts of the lymphatic system such as the lymph nodes, spleen, and thymus. There are two main types of lymphatic cells, T cells and B cells.nce activated, helper T cells start to divide and to produce proteins that activate B and T cells as well as other immune cells. The killer T cell is specialized in attacking cells of the body infected by viruses and sometimes also by bacteria. It can also attack cancer cells.
Use tubercular in a sentence. 1  of, like, or having a tubercle or tubercles. 2  of, relating to, or having tuberculosis. 3  caused by the tubercle bacillus.
A thin-walled blood vessel that returns blood toward the heart from the venules. myocardium. middle and largest layer of the heart wall, composed of cardiac muscle. ventricles. A general term for a cavity in the heart, one of the two chambers that receives blood from an atrium and pumps it into an artery.