Hilliard Patho 370 Week 2 Quiz Questions and Answers 2023 Already Passed Satisfaction Guaranteed
Type I hypersensitivity - CORRECT ANSWER (atopic or anaphy-lactic) is an immediate allergic or anaphylactic type of reaction mediated pri-marily by sensitized mast cells How is Type I hypersensitivity initiated? - CORRECT ANSWER initiated when IgE antibodies located on the mast cell membrane are bound by antigen, with subsequent cross-linking of IgE receptors. Mast cell degranulation releases chemicals that mediate the signs and symptoms of anaphylaxis. What is released and caused by Type I hypersensitivity? - COR-RECT ANSWER Released (from mast cells): histamine, kinin, pros-taglandins, interleukins. leukotrienes cause increased vascular permeability, vasodilation, hypotension, urticaria, and bronchoconstriction. How long does type I hypersensitivity occur? - CORRECT AN-SWER Occurs within 15-30mins Examples of type I hypersensitivity - CORRECT ANSWER drug reactions, rhinitis, atopic eczema, bee sting reactions, and asthma. Type II Hypersensitivity - CORRECT ANSWER (cytotoxic or cy-tolytic) occurs when antibodies are formed against antigens on cell sur-faces, usually resulting in lysis of target cells
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