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Chemistry

How Buffer Solutions Maintain pH in Biological Systems

Quick fact

A buffer system in human blood can neutralize more than 100 times the amount of acid that would otherwise cause fatal pH changes, all through a simple chemical balancing act.

Why this is interesting

Your blood is slightly alkaline—around pH 7.4—yet you pour acidic lemon juice into your stomach, and your muscles produce lactic acid during exercise. How does your body keep its internal pH from swinging dangerously?