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Introduction to Immunology test with complete solutions(graded A+).
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Introduction to Immunology test with complete solutions(graded A+).
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Introduction toImmunology test with
complete
solutions(graded A+)
Three lines of defense in immune system
1) Barriers
- Mechanical
- Chemical
- Biological
2) Innate Immune System
3) Adaptive immune system
Mechanical barrier
, Intact epithelia are impermeable to micro-organisms --> Unless
breaches occur (wound, needles, mosquito)
Mucus and mucous membranes (resp, GI, urogenital) trap microbes -->
Cilia move them away (damage to cilia increase infection)
Urination clears the urinary tract
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Chemical Barrier
Acid environment --> Stomach and vagina
Enzymes --> Stomach enzymes
Anti-microbial molecules
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