Micro 03-12-08 - Whitney Barter Ch. 15 R 1, 2, 5, 7-9, 11;...

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Whitney Barter Ch. 15 – R 1, 2, 5, 7-9, 11; MC 3, 5, 10 3/12/08 1. List three portals of entry, and describe how microorganisms gain access through each. a. Mucous Membranes – Many bacteria and viruses gain access to the body by penetrating mucous membranes. The mucous membranes that are most commonly infiltrated are the G.I. and respiratory tracts. The respiratory tract is infected what microbes are inhaled into the nose or mouth in drops of moisture and dust particles. The G.I. tract is infected when microorganisms gain access via good, water and contaminated fingers. b. Skin – Some microorganisms gain access to the body through openings in the skin, such as hair follicles and sweat gland ducts. Some bore through or grow on skin or the conjunctiva of the eye. c. Parenteral Route – microorganisms gain access to the body when they are deposited directly into the tissues beneath the skin or into mucous membranes when these barriers are penetrated or injured. 2. Compare pathogenicity with virulence. Pathogenicity is the ability of a microorganism to produce a disease. Virulence is the degree of pathogenecity. 5. Compare and contrast the following aspects of endotoxins and exotoxins: bacterial source, chemistry, toxicity, and pharmacology. Give an example of each toxin. Exotoxin
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This note was uploaded on 05/05/2008 for the course BIOL 357 taught by Professor Kalia during the Spring '08 term at University of Louisville.

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Micro 03-12-08 - Whitney Barter Ch. 15 R 1, 2, 5, 7-9, 11;...

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