3 sist.resp. resumo final
TRANSCRIPT
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Inspiraçãotorácica.
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Características - Ar Inspirado/Expirado
• Ar INSPIRADO
mais O2; menos CO2; azoto 79%;
Vapor água variável;
temperatura variável, de acordo com o ambiente;
• Ar EXPIRADO
menos O2; mais CO2;
azoto 79%; Vapor água saturado;
temperatura do interior do corpo;
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Movimentos Respiratórios
• Expiração
Quando ocorre a saída de ar dos pulmões, a expiração, acontece:
• O relaxamento dos músculos do diafragma e dos músculos intercostais;
• Eleva-se o diafragma e as costelas e esterno baixam;
• Diminui o volume da caixa torácica, expulsando o ar dos pulmões.
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Hematose pulmonar
As trocas gasosas entre o sangue e o ar existente nos pulmões designam-se por hematose pulmonar.
Durante a hematose, o oxigénio do ar atravessa as paredes dos alvéolos e passa para os capilares sanguíneos. Ao mesmo tempo, o dióxido de carbono transportado pelo sangue faz o percurso inverso, misturando-se com o ar alveolar.
O movimento dos gases deve-se à diferença de pressão. Assim, o oxigénio, com elevada pressão no interior dos alvéolos movimenta-se para os capilares, onde a sua pressão é mais baixa. O dióxido de carbono desloca-se em sentido contrário, uma vez que a sua pressão é maior nos capilares do que nos alvéolos.
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