I've got a big confusion about proximal convoluted tubule
Please tell me if i'm correct. This is what I think
-Sodium ions are actively pumped out from the basal membrane of tubule into the blood capillary
-This creates a concentration gradient between the lumen of the tubule and the blood capillary
-Na+ diffuses from the lumen to the capillary(by facilitated diffusion) through a cotransporter that carries glucose as well
-So glucose and Na+ diffuse into the blood capillary and the concentration of ions decrease in the tubule, so water follows by osmosis..
...And this is what mark scheme says...
Na+ actively transported (out of cell) into blood ;
creates concentration gradient ;
Na+ enters cell by diffusion ;
through cotransporter / symporter proteins ;
glucose cotransported / facilitated diffusion (from lumen to cells) ;
glucose diffuses into blood capillaries ;
I dont get what is 'cell' over here, is it the tubule or the blood capillary???
Please tell me if i'm correct. This is what I think
-Sodium ions are actively pumped out from the basal membrane of tubule into the blood capillary
-This creates a concentration gradient between the lumen of the tubule and the blood capillary
-Na+ diffuses from the lumen to the capillary(by facilitated diffusion) through a cotransporter that carries glucose as well
-So glucose and Na+ diffuse into the blood capillary and the concentration of ions decrease in the tubule, so water follows by osmosis..
...And this is what mark scheme says...
Na+ actively transported (out of cell) into blood ;
creates concentration gradient ;
Na+ enters cell by diffusion ;
through cotransporter / symporter proteins ;
glucose cotransported / facilitated diffusion (from lumen to cells) ;
glucose diffuses into blood capillaries ;
I dont get what is 'cell' over here, is it the tubule or the blood capillary???