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O que é a resposta imunitária?
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ISBN10: 6208607655
ISBN13: 9786208607654
Publisher: Edicoes Nosso Conhecimento
Published: Jan 31 2025
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208607654
Publisher: Edicoes Nosso Conhecimento
Published: Jan 31 2025
Pages: 72
Weight: 0.24
Height: 0.17 Width: 6.00 Depth: 9.00
Language: Portuguese
O sistema imunitário distingue dois grupos de substâncias estranhas. Um grupo é constituÃdo por antigénios que circulam livremente no corpo. Estes incluem moléculas, vÃrus e células estranhas. Um segundo grupo é constituÃdo por células próprias que apresentam proteÃnas MHC aberrantes. Dependendo do tipo de invasão estrangeira, ocorrem duas respostas imunitárias diferentes: A resposta humoral (ou resposta mediada por anticorpos) envolve células B que reconhecem antigénios ou agentes patogénicos que circulam na linfa ou no sangue (humor é um termo medieval para o fluido corporal). A resposta mediada por células envolve principalmente células T e responde a qualquer célula que apresente marcadores MHC aberrantes, incluindo células invadidas por agentes patogénicos, células tumorais ou células transplantadas.
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