Chapter 36-Immune System - Chapter 36 Immunity Defenses...

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Click to edit Master subtitle style Chapter 36 Immunity – Defenses Against Disease
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Defense against Invasion 3 Major lines of defense 1. Nonspecific External Barriers 2. Nonspecific Internal Defenses 3. Specific Immune Responses
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Nonspecific External Barriers Skin & Mucous Membranes
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Mucous membranes (digestive, respiratory & urogenital tracts) secrete antibacterial enzymes ( lysozymes ) that destroy bacteria cell walls. Nonspecific External Barriers
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Cilia (small hairs) physically trap microbes in the mucous until coughed or sneezed out If swallowed, stomach acid and enzymes destroy them. Nonspecific External Barriers
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If they get by that . . . Second Line of Defense Nonspecific internal defenses 1. Phagocytic cells - army of white blood cells that engulf and digest microbes
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Nonspecific Internal Defenses 2 Kinds of Phagocytes (travel in the blood stream) A. Macrophages - “big eaters” - ingest dead and dying cells to renew tissues B. Neutrophils - ingest dead and dying cells, cellular garbage, and microbes
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2. Natural killer cells - white blood cells that attack body cells that are cancerous or have been infected with a virus Nonspecific Internal Defenses
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Inflammatory Response •. Mast cells secrete histamine into the wounded area, increasing blood flow, and water into the area •. Attracts
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This note was uploaded on 05/27/2011 for the course BIO 112 taught by Professor Kirkpatrick during the Spring '11 term at Moraine Valley Community College.

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Chapter 36-Immune System - Chapter 36 Immunity Defenses...

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