Tubular reabsorption a. of glucose and many other substances is a Tₘ -limited active transport process, b. of chloride is always linked to the passive transport of Na⁺ , c. is the movement of substances from the blood into the nephron, d. of sodium occurs only in the proximal tubule.

Video transcript

Hey, everyone. Let's take a look at this question together, identify the incorrectly matched pair with respect to tubular reabsorption of substances in various parts of a Nephron. And here we have four different answer choices containing different parts of a Nephron as well as some substances that are reabsorbed. And we have to determine which of the following answer choices contains the part of a Nephron with its incorrectly matched pair. So here we have four different answer choices consisting of various parts of a Nephron and some possible substances that are reabsorbed. And we have to determine which of the following answer choices contains the part of a Ne Ephron with its incorrectly matched reabsorbed substances. So, in order to solve this question, we have to recall those various parts of a Nephron and what substances are reabsorbed in those parts of a Nephron to identify the incorrectly matched pair. And we are able to identify the incorrectly matched pair by using the chart on the screen which contains the various tubule segments and what substances they reabsorb. So starting off with answer choice A, we have the PC T which is the proximal convoluted tubule and it says that it reabsorbs sodium, virtually all nutrients, h2o lipid soluble solutes and urea. While looking at our graphic, we can see that we have the proximal convoluted tubule or the PC T. And we see we have sodium, virtually all nutrients. We have water and we have lipid soluble solutes as well as urea. Which means that answer choice A is a correctly matched pair. So it is an incorrect answer. Answer choice B we have the descending limb of the loop of Henle and it reabsorbs water which looking at our table, we have the descending limb which reabsorbs water. So answer choice B is also a correctly matched pair. So it is an incorrect answer. Answer choice C, we have the ascending limb of the loop of Henle which reabsorbs water, sodium fluoride, potassium, calcium and magnesium. While looking at our table, we can see we have the ascending limb of the loop of Henle which reabsorbs sodium fluoride, potassium, calcium and magnesium. However, we do not see H2O or water since the ascending limb of Henne does not reabsorb water and in fact, is impermeable to water. Therefore, answer choice C is an incorrectly matched pair. So answer choice C is the correct answer. I hope you found this video to be helpful. Thank you and goodbye.