What is the normal pH range?

What is the normal pH range?

• A. 7.35-7.45
• B. 7.00-7.20
• C. 7.50-7.60
• D. 7.20-7.30

Answer: (A)

Maintaining a narrow pH window is crucial because enzyme activity and many physiological processes depend on a specific hydrogen ion concentration. The normal arterial blood pH is about 7.35 to 7.45, a range kept tightly by buffering systems and adjustments from the lungs and kidneys. Values outside this window indicate imbalance: below 7.35 is acidemia, above 7.45 is alkalemia. The other ranges are outside the healthy span, being either too acidic or too basic for normal function.

Maintaining a narrow pH window is crucial because enzyme activity and many physiological processes depend on a specific hydrogen ion concentration. The normal arterial blood pH is about 7.35 to 7.45, a range kept tightly by buffering systems and adjustments from the lungs and kidneys. Values outside this window indicate imbalance: below 7.35 is acidemia, above 7.45 is alkalemia. The other ranges are outside the healthy span, being either too acidic or too basic for normal function.