Here's a breakdown:
* pH: A measure of acidity or alkalinity. A pH of 7 is neutral, below 7 is acidic, and above 7 is alkaline.
* Physiological: Relating to the normal functioning of living organisms.
* Human: Referring to the human body.
Specific values:
* Blood pH: The most critical, typically maintained between 7.35 and 7.45. This is slightly alkaline.
* Other fluids: Different fluids in the body have slightly different pH ranges, but they are all closely regulated. For example, the stomach has a very acidic pH (around 1.5-3.5) to aid digestion.
Why it's important:
* Enzyme function: Most enzymes in the body work optimally within a specific pH range. Changes in pH can disrupt enzyme activity, leading to problems with metabolism and other vital processes.
* Cell function: Cells are sensitive to pH changes. Extremes in pH can damage cell membranes and disrupt cellular processes.
* Buffer systems: The body has sophisticated buffer systems to maintain pH stability. These systems use chemicals that neutralize acids and bases, preventing drastic fluctuations in pH.
Disruptions and consequences:
* Acidosis: When the blood pH falls below 7.35, the body becomes too acidic. This can lead to various problems, including fatigue, confusion, and even coma.
* Alkalosis: When the blood pH rises above 7.45, the body becomes too alkaline. This can also cause problems, such as muscle weakness, tremors, and seizures.
In summary, the physiological pH of a human is a critical factor in maintaining overall health and wellbeing. The body has complex mechanisms to ensure that pH remains within a narrow range, preventing harmful consequences.
