Question 1
In the lumen of the proximal tubule, Na
+ concentration is ________ the Na
+ concentration inside the cells of the tubule wall.
◦ about the same as
◦ slightly lower than
◦ much higher than
◦ much lower than
◦ slightly higher than
Question 2
The basic pattern for many molecules absorbed by Na
+-dependent transport involves this: an apical ________ and a basolateral ________.
◦ osmotic gradient, symport protein
◦ symport protein, facilitated diffusion carrier
◦ facilitated diffusion carrier, osmotic gradient
◦ symport protein, osmotic gradient
◦ facilitated diffusion carrier, symport protein