or cellular immunity, occur through the T-cell system. On exposure to an antigen, the lymphoid tissues release large numbers of activated T cells into the lymph system. These T cells pass into the general circulation. There are three main groups of T cells: (a) helper. (b) cytotoxic T cells: which attack and kill microorganisms and sometimes the body's own cells.
Organ Donation Day. About Organ Donation Day. Organ Donation Day in India is celebrated on 13th of August every year by the people, government organizations and other related professions in order to motivate normal human beings to donate the organs as well as to understand the value of organ donation in the life of an individual.
117,000 men, women and children await lifesaving organ transplants. 1  Even the largest football stadium in the US could not fit the number of patients on the national transplant waiting list. 2  another person is added to the national transplant waiting list. 3  occur every year in the U.S. because organs are not donated in time.