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Bicarbonate (HCO3-) does not have a transporter, so its reabsorption involves a series of reactions in the tubule lumen and tubular epithelium. It begins with the active secretion of a hydrogen ion (H+) into the tubule fluid via a Na/H exchanger: In the lumen, the H+ combines with HCO3- to form carbonic acid (H2CO3). Luminal carbonic anhydrase enzymatically converts H2CO3 into H2O and CO2. CO2 freely diffuses into the cell. In the epithelial cell, Cytoplasmic carbonic anhydrase converts the CO2 and H2O (which is abundant in the cell) into H2CO3. H2CO3 readily dissociates into H+ and HCO3-. HCO3- is facilitated out of the cell's basolateral membrane.
Biologically it is the lumen.
The outer lumen of the mitochondria. All those protons being pumped into the outer lumen make it quite acidic.
From 550 to 750 lumens
it will increase osmolarity of the filtrate
first both wastes and needed materials,such as glucose,are filtered out of the blood.then,much of the needed material is returned to the blood,and the wastes are eliminated from the body
It gets absorbed into the blood stream via Lumen and a Glucose/Na+ symporter, Na+/K+ atpase and glucose 2 uniporter, but essentially is absorbed into the blood stream.
the sodium-potassium pump in the basolateral membrane of the epithelial cell, cotransporter proteins in the apical membrane of the epithelial cell, and higher sodium ion concentration in the lumen than in the epithelial.
Lumen
Double-lumen PICC lines come in two colors. Red is the blood access lumen or arterial lumen and blue is the blood return lumen or venous lumen. Despite the names, neither lumen is leads to an artery, but both lead into a vein.
Loop diuretics act by competing for the chloride site on the Na-K-2Cl cotransporter. Inhibiting sodium chloride reabsorption also inhibits the backleak of potassium and the generation of the lumen-positive potential. As a result, calcium excretion rises.
the lumen is bright
Basically Co-transport is the movement of molecules such as Glucose and Amino Acids into the epithelial cells lining the small intestine.This can be quite complicated to learn.In this case we'll look at Glucose :)There are three different protein carriers/channelszperiodzFirstly Sodium ions in the epithelium are taken actively out of the epithelium and into the blood by the sodium-potassium pump.This process is active transport as it uses ATP.This in turn causes the sodium ion concentration to lower.So there is a low concentration of sodium ions in the epithelium but a high concentration in the lumen of the small intestine. Therefore the sodium ions in the lumen can now diffuse down the concentration gradient and into the epithelium, however as they do they couple with Glucose molecules in the lumen and drag them into the epithelium with them.The protein channel used is the co-transport protein.There is now a high concentration of Glucose in the epithelium and a low concentration in the blood, therefore by Facilitated difussion the glucose molecules are taken into the blood :) Hope that helps !!
Basically Co-transport is the movement of molecules such as Glucose and Amino Acids into the epithelial cells lining the small intestine.This can be quite complicated to learn.In this case we'll look at Glucose :)There are three different protein carriers/channelszperiodzFirstly Sodium ions in the epithelium are taken actively out of the epithelium and into the blood by the sodium-potassium pump.This process is active transport as it uses ATP.This in turn causes the sodium ion concentration to lower.So there is a low concentration of sodium ions in the epithelium but a high concentration in the lumen of the small intestine. Therefore the sodium ions in the lumen can now diffuse down the concentration gradient and into the epithelium, however as they do they couple with Glucose molecules in the lumen and drag them into the epithelium with them.The protein channel used is the co-transport protein.There is now a high concentration of Glucose in the epithelium and a low concentration in the blood, therefore by Facilitated difussion the glucose molecules are taken into the blood :) Hope that helps !!
Basically Co-transport is the movement of molecules such as Glucose and Amino Acids into the epithelial cells lining the small intestine.This can be quite complicated to learn.In this case we'll look at Glucose :)There are three different protein carriers/channelszperiodzFirstly Sodium ions in the epithelium are taken actively out of the epithelium and into the blood by the sodium-potassium pump.This process is active transport as it uses ATP.This in turn causes the sodium ion concentration to lower.So there is a low concentration of sodium ions in the epithelium but a high concentration in the lumen of the small intestine. Therefore the sodium ions in the lumen can now diffuse down the concentration gradient and into the epithelium, however as they do they couple with Glucose molecules in the lumen and drag them into the epithelium with them.The protein channel used is the co-transport protein.There is now a high concentration of Glucose in the epithelium and a low concentration in the blood, therefore by Facilitated difussion the glucose molecules are taken into the blood :) Hope that helps !!
The cells lining the proximal tubules of the nephrons have a highly folded cell membrane on the lumen side of the tubule made of microvilli. This is referred to as a brush border and is important in increasing the surface area for reabsorption of components of the filtrate as it passes down the nephron.
Bicarbonate (HCO3-) does not have a transporter, so its reabsorption involves a series of reactions in the tubule lumen and tubular epithelium. It begins with the active secretion of a hydrogen ion (H+) into the tubule fluid via a Na/H exchanger: In the lumen, the H+ combines with HCO3- to form carbonic acid (H2CO3). Luminal carbonic anhydrase enzymatically converts H2CO3 into H2O and CO2. CO2 freely diffuses into the cell. In the epithelial cell, Cytoplasmic carbonic anhydrase converts the CO2 and H2O (which is abundant in the cell) into H2CO3. H2CO3 readily dissociates into H+ and HCO3-. HCO3- is facilitated out of the cell's basolateral membrane.