What is one physiological process or body region that is highly sensitive to pH fluctuations? What everyday changes can be made to influence the pH of this process or region?

The correct answer is - digestion.

Explanation:

In the human body, almost everybody organ has some system or physiological process that is highly sensitive to random pH changes. Digestion is one of the major physiological processes that also affected by pH fluctuations.

If there is a change in the pH, it will directly affect the process of digestion. The acid that is released by the stomach in the process of digestion is neutralized by the nervous system.

Thus, the correct answer is - digestion.