Biological fluids regulate pH values using buffers. This is achieved by accepting H⁺ ions when pH is low and donating H⁺ ions when pH is high.
pH is the potential of hydrogen, that gives an idea about the acidity of basicity of a solution. pH can have values ranging from 0 to 14. A pH value of 7 is neutral. Values below 7 are acidic and values above 7 are basic.
Buffers are the solutions that have the ability to resist any change in pH when any acidic or basic component is added to them. A buffer solution consists of a weak acid and its conjugate base or vice versa. The human body consists of natural buffer, which is blood.
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