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In the kidney, very large volumes of water and solutes are filtered across the filtration membrane because:W) plasma proteins exert an osmotic effectX) filtrate in the space of the Bowman's capsule exerts a high hydrostatic pressureY) glomerular capillary endothelium is thick endotheliumZ) glomerular hydrostatic pressure (blood pressure) is highQuestion 46Select one:a.if only W, X and Y are correctb.if only W and Y are correctc.if only X and Z are correctd.if only Z is correcte.if all are correct

Question

In the kidney, very large volumes of water and solutes are filtered across the filtration membrane because:W) plasma proteins exert an osmotic effectX) filtrate in the space of the Bowman's capsule exerts a high hydrostatic pressureY) glomerular capillary endothelium is thick endotheliumZ) glomerular hydrostatic pressure (blood pressure) is highQuestion 46Select one:a.if only W, X and Y are correctb.if only W and Y are correctc.if only X and Z are correctd.if only Z is correcte.if all are correct

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Solution

Para responder a esta pregunta, es importante entender los factores que afectan la filtración en los riñones:

W) Las proteínas plasmáticas ejercen un efecto osmótico: Esto es cierto, pero este efecto generalmente actúa para retener agua en los capilares y no para promover la filtración.

X) El filtrado en el espacio de la cápsula de Bowman ejerce una alta presión hidrostática: Esto no es correcto. La presión hidrostática en el espacio de la cápsula de Bowman es relativamente baja en comparación con la presión hidrostática en los capilares glomerulares.

Y) El endotelio capilar glomerular es un endotelio grueso: Esto no es correcto. El endotelio capilar glomerular es fenestrado (tiene poros), lo que facilita la filtración.

Z) La presión hidrostática glomerular (presión sanguínea) es alta: Esto es correcto. La alta presión hidrostática en los capilares glomerulares es uno de los principales factores que promueven la filtración de grandes volúmenes de agua y solutos.

Por lo tanto, la respuesta correcta es:

d. si solo Z es correcta

This problem has been solved

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