chapter 43b - Immune System

chapter 43b - Immune System - response -proteins //...

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43.2 In acquired immunity, lymphocytes provide specific defenses against infection - acquired immunity = defense that is mediated by B lymphocytes (B cells) and T lymphocytes (T cells) - exhibits specificity, memory, & self-nonself recognition - lymphocytes body’s 2 nd major kind of defense - phagocytes begin to secrete cytokines = proteins that help activate lymphocytes - antigen = any foreign molecule that is specifically recognized by lymphocytes & elicits a
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Unformatted text preview: response -proteins // polysaccharides-some are dissolved in extracellular fluid (i.e. toxins)-many protrude from surface of pathogens / transplanted cells-lymphocyte recognizes & binds to small portion of antigen-⇒ epitope = antigenic determinant-single antigen has several different epitopes-each capable of inducing response from lymphocytes that recognize that epitope-antibodies (secreted by certain lymphocytes in response_ bind to specific epitopes...
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This note was uploaded on 04/17/2009 for the course BISC 220 taught by Professor Mcclure during the Spring '09 term at USC.

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