What is the normal arterial pH range?

What is the normal arterial pH range?

• A. 7.60-7.80
• B. 7.20-7.30
• C. 7.35-7.45
• D. 7.50-7.60

Answer: (C)

Arterial pH is kept within a very tight window because even small changes can alter enzyme activity, protein function, and overall cellular processes. The body uses buffers (bicarbonate) and adjusts ventilation to control CO2, plus the kidneys regulate bicarbonate and hydrogen ions to hold pH steady. The normal arterial pH is 7.35 to 7.45. Values above this range indicate alkalemia, while values below indicate acidemia. The other options fall outside the normal range, making them not normal.

Arterial pH is kept within a very tight window because even small changes can alter enzyme activity, protein function, and overall cellular processes. The body uses buffers (bicarbonate) and adjusts ventilation to control CO2, plus the kidneys regulate bicarbonate and hydrogen ions to hold pH steady. The normal arterial pH is 7.35 to 7.45. Values above this range indicate alkalemia, while values below indicate acidemia. The other options fall outside the normal range, making them not normal.