The Immune System:
The Body’s Defense
Lines Of Defense
Non-Specific Defense
 Neutrophils,
Macrophages,
Eosinophils, and Natural
killer cells
 Destroy or eat anything
abnormal or that is not
normally there
 Attack: microbes, viruses,
parasites, infected cells
Non-Specific Defense
 Inflammatory response:
 Release of chemicals
 Increased blood flow
 Increased body temperatures
Specific Immunity
 Lymphocytes and
Antibodies
 Combat specific Antigens
 Antigen: a foreign
molecules that elicits a
specific response
How do we gain Specific Immunity?
 Natural Active Immunity:
immunity by recovering from
disease
 Ex. Chicken Pox
 Artificial Active Immunity:
vaccination
 Ex. Flu
 Passive Immunity: transfer
from mother to child