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4 Cards in this Set
- Front
- Back
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What is different between the first and second levels to the third level? |
The first and second levels apply the same response to all pathogens, no matter what it is. |
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What are the two types of level 1 barriers? |
Physical and chemical external barriers. |
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Examples of physical barriers. |
Toughened skin, mucus-secreting membranes and ciliated membranes. |
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Examples of external chemical barriers. |
Lactic acid and lysosyme enzymes in tears. |
