In the cell have the chemical components which maintain the pH. So it always in optimum pH. The chemical components of solution is mineral salts in the form of phosphate salt solution.
The phosphate buffer system operates in the internal fluid of all cells. This buffer system consists of dihydrogen phosphate ions (H2PO4-) as hydrogen-ion donor (acid) and hydrogen phosphate ions (HPO42-) as hydrogen-ion acceptor (base). These two ions are in equilibrium with each other as indicated by the chemical equation below.
H2PO4-(aq) -----> H+(aq) + HPO42-(aq)





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