From which parts of the nephron listed below were the samples A-E obtained? For each sample, give an explanation for your answer based on its composition. • Glomerular capillary (GLOM) • Start of the proximal convoluted tubule (PCT) • Tip of the descending loop of Henle (LOH) • Start of the distal convoluted tubule (DCT) • End of the collecting duct (CD)

SamplePart of the nephronExplanation

Table 1. Composition of solutions taken from different parts of the nephron. Sample A B с D E Osmolarity (mOsM) 285 1000 285 2.  Why does the concentration of sodium remain constant along the length of the proximal convoluted tubule?

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