Lymphocytes (B cells)
B lymphocytes originate in bone marrow and colonize typhoid tissue.
When B cells are activated they enlarge and become plasma cells.
B cells and their derivative plasma cells are source of specific immunoglobulin antibodies.
So they are involved in humoral immunity or circulating immune reactions.
T Lymphocytes
T lymphocytes mature in the thymus gland before they colonize typhoid tissue.
They function by directly attacking the infected or cancer cells.
T lymphocytes are identified with cell mediated immunity.
T cell are able to kill cells of the body that are infected by a virus.
T cells recognizes antigen on surface of cell infected with a virus enabling T cell to bind to and kill infected cell.
T cell are essential to immune response because they have unique "memory" system which allow them to remember past invaders and prevent disease when a similar invader is encountered again.
0 Comments