Topic of the Month
1 July 2010
The immune system is responsible for the body’s own defenses. It has the task of fighting harmful substances like microorganisms and viruses that have invaded the body. It consists in part of white blood cells (leukocytes) that develop from the stem cells of the bone marrow. These include B lymphocytes, T lymphocytes, natural killer cells, granulocytes and monocytes. Lymph and blood vessels enable the cells of the immune system to circulate and detect antigens. The stronger the immune system, the better the body can defend itself against pathogens, deactivate damaged cells and disease.