2.9 Fighting Disease Pages 120-123. Pathogen A disease causing microorganism.

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Presentation transcript:

2.9 Fighting Disease Pages

Pathogen A disease causing microorganism

Syptoms From: tissue destruction body’s response to the invasion

toxins Many bacteria produce toxins that travel throughout the body Examples: Clostridium tetani locks muscles Corynebacterium diphtheriae prevents cell organelles from manufacturing proteins

External defenses Skin is a barrier Sweat contains salt and amino acids that poison bacteria Cells secrete mucous which captures and digests bacteria Cilia sweep particles up and out of the airways.

External defenses Tears contain enzymes Stomach acids kill bacteria in food and water

Lymphatic System Lymph is a transparent fluid containing lymphocytes. Lymph nodes and the spleen filter out microorganisms Bone marrow produces special WBC’s

Antibodies Response to antigens (foreign invaders) Antibodies attach to antigen and inactivate it Flag cell for macrophage consumption

Active Immunity Antibodies are specific

Passive immunity Mother to baby Plasma received from immune organism

Resisting Bacteria Infection Sterilization Disinfectants Antispetics Extermination Antibacterial medication

White Blood Cells Macrophages: engulf and digest invaders

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