Okay. So this one asks us which of the following statements is correct? Now I'm not going to read all of these verbatim because they can be a little bit long, but just looking at these answers, I can tell that our correct answer is going to be d, which says that cortical nephrons have shorter nephron loops and are located mainly in the renal cortex, whereas juxtamedullary nephrons have those longer loops and can extend deeper into the renal medulla. So our answer is d. Now just to take a quick look to make sure that we all understand why a through c are incorrect.
A reads that cortical nephrons have longer loops and that juxtamedullary nephrons have shorter loops. It should be the reverse. Right? So a is incorrect.
B reads that juxtamedullary nephrons are more abundant. And then, for cortical nephrons, the opposite is true. Right? About 80% of nephrons are cortical nephrons whereas about 20% are juxtamedullary. So that's why B is incorrect.
And then for C, we do have the correct locations there, but we have incorrect nephron loop lengths on both of these. So that is why C is incorrect and our answer here is D.
