Answer is: buffers.
Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.
Buffer solution changes pH very little when a small amount of strong acid or base is added to solution.
A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.
Weak acid and weak bases that can add or remove protons (h+) to fluids in the body, thereby helping to keep pH levels at homeostatic levels, are called BUFFERS.
Buffer is a solution that resists changes in pH when acid or alkali is added to it. Buffers typically involve a weak acid or alkali together with one of its salts.
