WHITE BLOOD CELLS

White blood cells, also produced in the bone marrow, play a vital role in the body's defense system.  Types of white cells include the granulocytes, the lymphocytes, and the monocytes.

Lymphocytes:
The lymphocytes, some of which live for many years, protect the body by making antibodies against invaders.  Lymphocytes are produced in the bone marrow and migrate to the lymph nodes, spleen, and thymus gland.  Two major types are recognized: T and B cells.

The B cells produce antibodies in response to the recognition of the presence of foreign materials called antigens.  The circulating antibodies react with their specific antigens, rendering them inactive.  T cells have fixed antibodies on their surfaces.  There are involved in cellular immune response.

Monocytes:
Monocytes are large cells functionally related to the lymphocytes; they consist about 6 to 10 percent of the total white cells found in the body.  After ingestion of foreign material, the monocytes work with lymphocytes to produce antibodies.
 

Click on each component to learn more:
Red Cells
White Cells
Platelets
Plasma