Micro 04-28-08 - Whitney Barter Ch 24 R 1-5 7-11 MC 2 1...

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Whitney Barter Ch. 24 – R 1-5, 7-11; MC 2 4/28/08 1. Respiratory diseases are usually transmitted by droplet infection . 2. Describe how microorganisms are prevented from entering the upper respiratory system. How are they prevented from causing infections in the lower respiratory system? Upper Respiratory System Coarse hairs in nose filter large particles from air entering the respiratory tract. The ciliated mucous membranes of the nose and throat trap airborne particles and remove them from the body. Lymphoid tissue, tonsils, and adenoids provide immunity to certain infections. Lower Respiratory System The ciliary escalator helps prevent microorganisms from reaching the lungs. Microbes in the lungs can be phagocytized by alveolar macrophages. Respiratory mucus contains IgA antibodies. 3. How do the normal microbiota of the respiratory system illustrate microbial antagonism? The normal microbiota prevent potentially pathogenic microorganisms from causing
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Micro 04-28-08 - Whitney Barter Ch 24 R 1-5 7-11 MC 2 1...

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