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.
Facts about Organ Donation. 1  One organ donor can save up to eight lives. 2  More than 120,000 people in the United States are waiting for organ transplants. 3  On average, 18 people die every day while waiting for organ transplants in the U.S., and every 10 minutes, another name is added to the waiting list.