The kidneys excrete hydrogen ions and produce which buffer to maintain acid-base balance?

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Multiple Choice

The kidneys excrete hydrogen ions and produce which buffer to maintain acid-base balance?

Explanation:
The kidneys regulate acid-base balance by excreting hydrogen ions while generating and reabsorbing bicarbonate, which serves as the main buffer restoring blood pH. As hydrogen ions are secreted into the tubular fluid, new bicarbonate is produced (via carbon dioxide and water metabolism in kidney cells) and then returned to the bloodstream, helping to neutralize excess acid. Ammonia and phosphate do buffer urinary hydrogen ions, but bicarbonate is the primary buffer produced to maintain systemic acid-base balance. Sodium is not a buffering agent.

The kidneys regulate acid-base balance by excreting hydrogen ions while generating and reabsorbing bicarbonate, which serves as the main buffer restoring blood pH. As hydrogen ions are secreted into the tubular fluid, new bicarbonate is produced (via carbon dioxide and water metabolism in kidney cells) and then returned to the bloodstream, helping to neutralize excess acid. Ammonia and phosphate do buffer urinary hydrogen ions, but bicarbonate is the primary buffer produced to maintain systemic acid-base balance. Sodium is not a buffering agent.

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