Immunity. It is the ability of the body to protect itself against foreign agents [I] Natural [II] Acquired immunity immunity. These are foreign agents protein or glycoprotein which produce an immune response e.g bacteria, viruses and foreign cells.
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These are substances with low molecular weight (<8000)
as drugs(pencillin) which combine with a protein in the
body and then behaves as a foreign protein and initiates
(1) Intact skin.
- Engulfing of foreign particles
- Destruction and digestion of engulfed organisms
(3) The presence of
certain chemical structures as Lysozymes
Bone marrow lymphocytes precursors
Cell mediated immunity
The memory T & B cells persist in the body for years and readily converted to effector cells by exposure to the same antigen giving more rapid and greater immune response as in vaccination.