Some macrophages are large cells that act as scavengers, ingesting and rendering harmless invading cells and substances. T-cells also secrete lymphokines , which are messenger chemicals that can call many other types of cells and chemicals into the fray. As mentioned, B-cells' primary weapon is the secretion of antibodies. An antibody is tailor made to match a specific invading antigen. Well, the B-cell puts these blueprints to work.
Antibodies are effective in a number of ways.
While they cannot penetrate living cells, they are able to neutralize toxins produced by bacteria, and block viruses from entering into cells. Others coat the surface of a bacteria cell, making it 'palatable' to the scavenger macrophage. There are many other ways in which the various cells of the immune system interact, and research is constantly uncovering new clues as to the intricacies of the immune system. Some people inherit the ability to produce immune reations to normally harmless antigens, commonly including plant pollens, mold, and house dust. In the forst encounter with one of these 'harmless' antigens, the body produces antibodies which are distributed far and wide by way of mast cells .