when the first line of defense is penetrated the second line comes into play
*They are all working together, all the time
3. Dendritic Cells
Most abundant leuocyte in the blood.
First responders to the infection
Primary component of pus
55-80% of leukocytes (white blood cells)
1. Begin as monocytes which are made in the bone marrow
Move to damaged tissue
2. Mature into macrophages
Present antigens in adaptive immunity
Found in the blood & tissues that are exposed to externam environment
They recogonize the macromolecules associated with pathogens
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