human cell pH ! fixative cell in Electron Microscopy

The hydrogen potential, noted pH , is a measure of the chemical activity of hydrons (also commonly called protons or hydrogen ions) in solution. In particular, in aqueous solution, these ions are present in the form of the hydronium ion (the simplest of the oxonium ions).

The acid-base balance, or homeostasis of the pH is a function of the human body which aims to regulate the pH of the plasma. 

The pH plasma normally varies from 7.38 to 7.42. 

We speak of acidosis in the event of a decrease in pH and alkalosis in the event of an increase in it.

In Electron Microscopy processing biological sample (mammal) the pH of the solutions is close to 7 to 7.4.