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A respiração é uma função vital, inata e automática para a sobrevivência do indivíduo, sendo a primeira função pós-natal. O sistema respiratório consiste num conjunto de órgãos tubulares e alveolares situados na cabeça, pescoço e cavidade torácica que participam nas trocas gasosas realizadas entre o indivíduo e o meio externo. Antes de chegar aos pulmões, o ar inspirado tem de percorrer um longo caminho, atravessando estruturas como a cavidade nasal, faringe, laringe, traqueia e brônquios. A e
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