immunesystem

immunesystem - Biology 2201 Unit 3 – Dynamic Equilibrium...

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Unformatted text preview: Biology 2201 Unit 3 – Dynamic Equilibrium Section 6- Immune System What is Immunity? 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. 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. 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 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 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. This is a specific response to a specific...
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This note was uploaded on 11/07/2011 for the course BIOLOGY 100 taught by Professor Staff during the Winter '08 term at BYU.

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immunesystem - Biology 2201 Unit 3 – Dynamic Equilibrium...

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