What is the normal pH range of human blood?

The normal pH range of human blood is critical for maintaining various physiological processes. A pH level between 7.35 and 7.45 is considered optimal for human blood, as it allows for efficient oxygen transport, enzyme function, and overall metabolic stability. Deviations from this range can lead to acidosis (if the pH falls below 7.35) or alkalosis (if it rises above 7.45), both of which can have significant adverse effects on bodily functions.

The chosen range, 7.35 to 7.45, reflects the body’s intricate regulation of pH through various mechanisms, such as respiratory control of carbon dioxide and renal regulation of bicarbonate. This balance is essential for sustaining homeostasis and is crucial for life.

In contrast, other ranges listed do not accurately represent the normal physiological pH levels. A range of 6.8 to 7.2 indicates a state of acidosis, while 7.5 to 7.8 and 7.8 to 8.0 suggest alkalosis, both of which could impair metabolic processes and physiological functions if sustained.