Quiz 24 - proliferate to form antigen-attacking effector...

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Question 1 Multiple Choice 0.5 points Free divers often hyperventilate before descending in order to prolong the time they can hold their breath under water. Which one of the following statements about this procedure is false? Hyperventilation increases the pH of the blood. Hyperventilation decreases the partial pressure of carbon dioxide in the blood. Underwater time can be prolonged by minimizing physical exertion. Hyperventilation increases the saturation of hemoglobin with oxygen. Question 2 Multiple Choice 0.5 points Which of the following is not one of the body’s nonspecific defense mechanisms? Secretion of tears containing lysozyme. Natural killer cells attacking virus-infected cells. Secretion of antibodies by B-lymphocytes. Secretion of pyrogens by leukocytes. Secretion of histamine by mast cells. Eosinophils attacking parasites. Question 3 Multiple Choice 0.5 points Which one of the following statements about the body’s defenses is false? A particular antigen activates one or a small number of lymphocytes, which
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Unformatted text preview: proliferate to form antigen-attacking effector cells and memory cells. During embryonic development, lymphocytes are destroyed if they respond to epitopes on native (self) cells. The major histocompatibility complex is a set of genes encoding cell surface glycoproteins that are important in cell recognition. T-lymphocytes are referred to as plasma cells when they secrete antibodies. Question 4 Multiple Choice 0.5 points Which one of the following statements about inflammation is false? Delivery of oxygen and nutrients is aided by increased fluid flow through inflamed areas. During inflammation, plasma proteins leak into the extravascular space, increasing the rate at which water leaves capillaries by osmosis. Histamine released from mast cells causes relaxation of smooth muscle in the walls of capillaries, which increases local blood flow. Neutrophils accumulate in the extravascular space in inflamed areas....
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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