Final answer:
The descending loop of Henle is the only part of the nephron, in addition to the glomerulus, that does not require Na-K-ATPase because it does not engage in active transport of sodium or potassium.
Step-by-step explanation:
The question is asking which part of the nephron, besides the glomerulus, does not require Na-K-ATPase. The only segment of the nephron where Na-K-ATPase is not required is the descending loop of Henle. The reason is that this part of the nephron is primarily permeable to water and does not actively transport sodium or potassium, thus Na-K-ATPase enzymes are not necessary here. The remainder of the nephron, including the proximal tubule, the ascending loop of Henle, distal tubule, and collecting duct, all require Na-K-ATPase for the active transport of ions to regulate water and electrolyte balance.