immunesystem - Biology2201 Unit 3 Dynamic Equilibrium...

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Biology 2201 Unit 3 – Dynamic Equilibrium Section 6- Immune System
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What is Immunity?
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Immunity Immunity The ability of the body to fight infection and/or foreign invaders by producing antibodies or killing infected cells. Immune System The system in the body responsible for maintaining homeostasis by recognizing harmful from nonharmful organisms and produces an appropriate response.
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Foreign Invaders Called Pathogens Viruses, bacteria or other living thing that causes disease/immune response. Antigens Toxins that pathogens produce that cause harm to an organism.
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Parts of the Immune System 1. Blood - White Blood Cells in particular. 2. Lymph nodes 3. Thymus Gland – Produces T Lymphocytes 4. Bone Marrow – Produces B Lymphocytes
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How does the body fight infection/foreign invaders? The Body’s THREE lines of Defense First Line of Defense – The Skin Provides Physical and Chemical barriers Physical – hard to penetrate, made of indigestible keratin Chemical – tears, sweat
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Second Line of Defense  –  Nonspecific Immune Response These are defenses the body uses no matter what the invader may be. These defenses include: Phagocytosis done by Macrophages Natural Cell Killers Inflammation - caused by release of Histamine from leukocytes Fever – caused by histamines. The fever (high temp) kills invaders by denaturing their proteins. Macrophage : A phagocytic cell found in the liver, spleen, brain and lungs. Travels to all areas of the body to find and eat pathogens.
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This is a specific response to a specific pathogen/antigen.
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