How are bones involved in acid-base regulation?

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Bones act as a long‑term buffer reserve in acid–base balance. The mineral matrix of bone contains carbonate and phosphate, which can react with excess acids or bases to help stabilize pH. When there’s too much acid, hydronium ions can be buffered by these bone minerals, leading to dissolution of some mineral content and release of alkaline components that neutralize the acid. This buffering helps minimize pH fluctuations over time, even though it’s slower than the lungs or kidneys, which handle rapid pH changes. In alkalosis, bones can also participate by adjusting mineral content to help restore balance.

This is why the idea that bones absorb excessive hydronium or hydroxyl ions to dampen pH swings captures the buffering role bones play. The other options don’t fit because bones aren’t primarily producing acid, they do participate in buffering rather than being irrelevant, and buffering is not done by pumping bicarbonate into urine—that kidney process is separate from bone buffering.