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.
Some organs and tissues can be donated by living donors, such as a kidney or part of the liver, but most donations occur after the donor has died. As of August 1, 2016, there are 120,004 people waiting for life-saving organ transplants in the US. Of these, 96,645 await kidney transplants.