The high osmolarity of the renal medulla is maintained by which of the following? (A) active transport of salt from the upper region of the descending limb. (B) the loose packing of juxtamedullary nephrons. (C) diffusion of urea into the collecting duct. (D) diffusion of salt from the descending limb of the loop of Henle

Video transcript

Hello everyone. And in today's video we have to follow him problem which region of the kidney has high hopes similarity as a result of diffusion of salt from descending limb of the loop of Henle. And so let us just go over how the loop of hand it works in the kidneys. So we can understand this problem for the loop of Henle. It is used to transport filtration in the kidneys. It has a descending limb and it has an ascending limb. Now the way that these two lines work is that they reabsorb mostly different things. The descending limb is going to be re absorbing mostly water. All the ascending limb is going to be actually just re absorbing solute particles such as salt and more. So what happens is that we need to find the one that has the most osmolarity in this case osmolarity is a measure of salute concentration. So whichever limb has the most solute concentration will be the one with the highest osmolarity. And so the way that this works is that the descending limb will be re absorbing mostly water. So the fill trade will have a lot of solute and not a lot of water. So the osmolarity hell will be very high while in the ascending limb, most salute will be reabsorbed and water will state in the filter it. So the osmolarity here will be very low and so this results in the areas that are close to the descending limb or are in the descending limb having very high osmolarity and from their answer choices given answer choice. B the red and medulla is the one located in the descending limb and thus will have the highest similarity, and so that is going to be the final answer to our question. I really hope this video helped him.