Q: In the process of renal tubular reabsorption, which ion is exchanged for sodium?  

Answer: B

Renal tubular reabsorption is the process by which the kidneys reclaim water and solutes from the tubular fluid and return them to the bloodstream. Sodium is actively reabsorbed in the proximal tubules of the nephron, which creates a concentration gradient that drives the passive reabsorption of other ions such as chloride and potassium. Potassium is reabsorbed in exchange for sodium in the distal tubules and collecting ducts of the nephron. The exchange of sodium and potassium ions is important for regulating the body's electrolyte balance and maintaining proper cellular function.

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