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.
(Newser) â You know what they say: You're never too old to donate an organ. Well, they should say that, anyway. The Evening Times reports a woman recently became Scotland's oldest organ donor after dying at the age of 107. Her corneas were removed and are now helping a young patient see. The message is, don't rule yourself out, says Lesley Hogan of NHS Blood and Transplant.