Chloride ions (Cl-) follow actively transported Na+ ions from nephron into the blood. Would you not expect the Cl- concentration to decrease as fluids are extracted along nephron? What causes the disrepancy noted?.. learing about urinary system.. kidneys..
BIO 12

Question

Chloride ions (Cl-) follow actively transported Na+ ions from nephron into the blood. Would you not expect the Cl- concentration to decrease as fluids are extracted along nephron? What causes the disrepancy noted?.. learing about urinary system.. kidneys.. 
BIO 12

koikkara · Answer

@soapia well, got two explanations...... Answer 1 The water concentration decreases, the chlorine concentration increases because it's not diluted by the water (you know like when you're making up a standard solution, the concentration [moldm-3] depends on the amount of solute dissolved in the solvent) Because the solution within the tubule has a lower concentration (thanks to osmosis) it causes Cl- to diffuse out of the tubule, the attraction to sodium of course helps... http://answers.yahoo.com/ Answer 2 According to my view, You would expect a decrease in Cl because it follows Na + ions that are actively transported from the nephron; however, water is also reabsorbed from the nephron. The more water that is reabsorbed, the more concentrated the remaining Cl ions become.