What is the normal pH range of blood?

What is the normal pH range of blood?

• A. 6.8-7.0
• B. 7.35-7.45
• C. 7.6-7.8
• D. 7.0-7.2

Answer: (B)

Blood pH must stay in a very tight window because enzymes and many cellular processes only function properly at those levels. The normal arterial blood pH is about 7.35 to 7.45. Values below this range indicate acidosis, while values above indicate alkalosis. The body maintains this balance with buffers (like bicarbonate), and by adjusting ventilation (CO2) and kidney function (bicarbonate handling). Small deviations can affect enzyme activity, protein structure, and oxygen delivery, so staying within 7.35–7.45 is crucial for normal physiology.

Blood pH must stay in a very tight window because enzymes and many cellular processes only function properly at those levels. The normal arterial blood pH is about 7.35 to 7.45. Values below this range indicate acidosis, while values above indicate alkalosis. The body maintains this balance with buffers (like bicarbonate), and by adjusting ventilation (CO2) and kidney function (bicarbonate handling). Small deviations can affect enzyme activity, protein structure, and oxygen delivery, so staying within 7.35–7.45 is crucial for normal physiology.