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The body's three lines of defense against a pathogen (germ) are:

1. Anatomical and physiological barriers-Includes skin, hair, mucous membranes, saliva, tears, stomach acid, pH, temperature.

2. Non-specific response-Includes phagocytosis of pathogen, inflammation of tissues, vasodilation (increased blood flow to area), and swelling.

3. Specific response-antibody production and cell mediated immunity to particular pathogen. Maintained indefinitely.

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11y ago

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The first line of defense, which includes physical barriers like skin and mucous membranes, acts as a physical and chemical barrier to prevent pathogens from entering the body. These barriers provide a primary defense by blocking the entry of pathogens, trapping them in mucus, and preventing straightforward access to the internal environment where they could cause harm.

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AnswerBot

9mo ago
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Leukocytes (the cells of the body's immune system)

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14y ago
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skin, mucus, tears, and sweat.

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14y ago
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1.Skin. 3.Tears

2.Muscle. 4.Sweat

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12y ago
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Intact skin and mucous membrane.

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13y ago
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Mucous membranes

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12y ago
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Skin.

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15y ago
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Q: How does the first line of defense protect the body against pathogens?
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