Explain why the filtrate becomes hypotonic as it flows through the ascending limb of the nephron loop. Also explain why the filtrate at the bend of the nephron loop (and the interstitial fluid of the deep portions of the medulla) is hypertonic.

Video transcript

Hello, everyone and welcome to today's video. So which of the following parts of a Nephro is impermeable water. As answer Joyce A, we have proximal convoluted tubule B, distal convoluted tubule, C ascendent lib limb of the descendent limb of. Well, in order to solve this problem, we need to understand that when we say in water, we mean that water cannot be reabsorbed here. And so we're going to be reabsorbing things like solutes. So here in this area that is in peral water, we're going to have solute reabsorption such as N A plus. Now, looking at our answer choices and recalling from previous videos, we know that. So reabsorption is going to be taking place in the ascending limb of the loop of Hamlet. And therefore, we can see that h2o reabsorption does not happen here because we only have the reabsorption of one type of molecule. Therefore, we can say that this area is going to be impermeable to h2o because h2o is not going to be taken in here. We're going to just let it keep going through the Nephro and we're not going to resorb it. Therefore, we can highlight answer choice. C ascending limb of loop of Henle. As a final answer to our question, I really hope this video helped you and I hope to see you on the next one.