The Body’s Defense Against Infection

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Presentation transcript:

The Body’s Defense Against Infection

Pg. 450 The First Line of Defense Eyes Skin Stomach Mucous Membranes/Saliva

Immune System A combination of body defenses made up of cells, tissues, and organs that fight off pathogens and disease Immunity Your body’s ability to resist the germs that cause a particular disease

Targets pathogen in a more specialized manner Nonspecific Response Specific Response Inflammation or increased blood flow to the infected area Specific white blood cells go to area and destroy pathogen If spreads- causes fever which can slow pathogen Triggers more WBC Targets pathogen in a more specialized manner Gives body ability to recognize same pathogen if it invades again Vaccinations

Antigens- substances released by invading pathogens Lymphatic System A secondary circulatory system that helps the body fight pathogens and and maintains the fluid balance Lymph and lymphocytes B cells T cells Antigens- substances released by invading pathogens Antibodies-proteins released by B cells that attach to antigens , keeping them from harming the body Antibodies are specific to each antigen and remain in blood in case of another infection

Immunity Natural immunity is present at birth Acquired Immunity Antibodies pass from mom to baby Breast feeding Active immunity- antibodies you make Vaccine A preparation of dead or weakened pathogens that is injected into the body to cause the immune system to produce antibodies

Vaccination Schedule Pg. 453