The following correctly shows the electron flow for the given reaction. 
Definitions:
Collecting Ducts
Collecting ducts are part of the kidney's nephrons, funneling urine from the nephrons to the ureters.
Renal Medulla
The inner region of the kidney, comprised of renal pyramids and involved in the concentration of urine.
Peritoneal Membrane
A serous membrane that forms the lining of the abdominal cavity or the peritoneum, involved in protecting abdominal organs.
Abdominopelvic Cavity
An anatomical space comprising the abdominal and pelvic cavities, containing vital organs including the stomach, liver, intestines, and reproductive structures.
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