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19 Cards in this Set
- Front
- Back
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Commensal
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Organism that derives benefit from the host without harming the host
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Mutualistic
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Both microbe and host derive benefit from the shared relationship
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Microbe populations change constantly
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-pH, moisture, other microbes present
-Intestinal flora varies with food eaten |
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Why do microbes hang out on in and in our bodies?
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-Rich in nutrients
-Controlled pH -Temperature -Osmotic Pressure |
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Skin microflora
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-difficult to colonize
-Dry salty acidic, protective oils, lysozyme -10^12 microbes in moist areas -Scalp ears armpits, genital and anal areas -Mostly anaerobes --Gram + tolerate salt well ----Staphylococcus ----Propionbacterium-degrades skin oil |
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Microbial flora of the oral cavity
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Dental caries: acid produced by plaque causes these; Streptococcus mutans especially contributes to peridontal disease and caries
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Gastrointestinal Tract Bacteria
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Helicobacter
Lactobacilli Bacteroides |
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Genitourniary Microflora
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Kidney, ureters and bladder are sterile
Lower part of urethra and vagina contain bacteria Naturally acidic scretions |
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Innate Immunity
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Born with
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Adaptive Immunity
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Antibiotics for specific bacteria
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White Blood Cells
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Neutrophils and monocytes
Basophyls, Eosinophils, Lymphocytes |
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Neutrophils
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Engulf and destroy microbes
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Monocytes=macrophages
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and dendritic cells
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Basophils and Eosinophils
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Release toxins to poison microbes
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Lymphocytes
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T cells: modulate specfic immune response
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T cells
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modulate specific immune response
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B cells
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produce antibodies to bind antigens
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Lymphatic system
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holds most of the lymphocytes
functions as filter |
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Innate Host Defenses
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Host defenses that produce resistance against infection can be adaptive or innate
Physical, Chemical, Cellular, Inflammation, Fever, Molecular defenses |
