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QUESTÕES SISTEMA RENAL
1. O que é clearance ou depuração de uma substância? Como é medida e qual o seu significado
fisiológico?
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2. O que é pressão efetiva de filtração? De quais fatores depende?
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3. Quais os requisitos para que uma substância possa ser usada para a medida da Taxa de Filtração
Glomerular?
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4. O que acontece com o clearance de glicose quando se eleva sua concentração plasmática?
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5. A que se deve a glicosúria do diabetes mellitus?
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6. Por que normalmente não aparece proteína na urina?
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7. Quais os mais importantes tipos de proteinúria, e quais suas causas?
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8. No caso de uma substância com clearance maior que a inulina, de onde podem provir as moléculas
excretadas na urina?
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9. A reabsorção de sódio é ativa ou passiva? Explique.
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10. O que é diurese osmótica? Qual o mecanismo da diurese osmótica induzida por sacarose ou manitol?
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11. Quais as vias pelas quais o sódio penetra no túbulo proximal?
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12. O que é absorção isosmótica de água?
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13. Onde é produzido o HAD? E qual sua função?
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14. Onde é produzida a aldosterona e qual sua função no balanço de sódio?
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15. Como é regulada a produção de aldosterona?
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16. Qual o papel do HAD no mecanismo de concentração urinária?
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17. Quais os mecanismos de regulação da ingestão de água?
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18. Quais fatores podem causar expansão isosmótica do volume extra-celular?
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19. Quais substâncias produzidas nos rins apresentam propriedades hipotensoras?
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20. O que é diurese causada por bloqueio de sódio?
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21. O que é mais vantajoso, o clearance de creatinina ou de inulina? Explique.
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22. Quais as características dos néfrons medulares?
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23. Qual o papel da anidrase carbônica na reabsorção do bicarbonato?
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24. De onde provém o NH3 secretado ao nível dos túbulos renais?
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25. Dê as funções exercidas pelos rins.
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26. Que fator estimula a produção de renina?
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27. Por que a excreção é considerada uma função homeostática?
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28. Como os rins ajudam a manter o equilíbrio ácido-básico do sangue?
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29. O que se entende por mecanismo de osmorregulação?
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30. O líquido intersticial que banha nossos tecidos é formado por componentes do plasma sangüíneo,
filtrado através das paredes dos capilares. Neste processo intervêm, principalmente, dois mecanismos:
pressão osmótica, resultante da existência de proteínas no sangue, e pressão da circulação sangüínea.
Suponha que ocorram as três situações seguintes:
(I) o rim passa a excretar grande quantidade de
proteínas;
(II) a pressão da circulação sangüínea diminua;
(III) os capilares sanguíneos sejam obstruídos.
Dentre as três situações acima, um aumento do líquido intersticial pode ser devido somente a qual(is)
situação(ões)? Comente.
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Complete a figura e o parágrafo abaixo:
A pressão arterial força a passagem de substâncias plasmáticas de 1 para _____ . Só não passa as
________________ ; portanto, em 3, a pressão _______________ deve ser __________ que em 1. A
solução
contida em 2 chama-se __________ e corresponde ao plasma sem _______________ . Quando uma
solução,
bastante diluída, chega a 4, é submetida a um processo de ___________ ; a água é reabsorvida por
__________
e os sais, aminoácidos e glicose são reabsorvidos por _______________ , que envolve gasto de energia.
Portanto, 5 recupera parte das substâncias que passaram de ______ para 2. Finalmente, a solução contida
em 6
pode ser chamada de ___________ .

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