Functions of WBC include combating inflammation and infections. Most WBC have the ability to crawl through capillary walls and connective tissue. This capability is called diapedesis or cell walking, Figure 12 . Once the WBC is in the tissue, it migrates to the site from where the signal for its need arises. The last type of agranular WBC, the lymphocyte, has been saved for this spot.
Antibodies are special proteins, which inactivate antigens.
The classical Ag-Ab response is shown in Figure 13 . The plasma cell fires up its machinery to begin producing and releasing specific Ab's into the blood and tissues. The Ab's bind with the Ag's, inactivating the Ag's. The Ag is then considered to have been neutralized and there is no effect caused by the Ag. Eosinophils phagocytize the Ag-Ab complex.