Question

The normal pH of arterial blood is:

• A. 7.0–7.2
• B. 7.35–7.45
• C. 7.5–7.6
• D. 6.8–7.0

Hint:

pH homeostasis is vital — small deviations can significantly impair enzyme activity and cellular function.

Answer 1

The Correct Option is B

The normal pH of arterial blood is crucial for maintaining proper physiological functions. The typical range for arterial blood pH is shown in the second option: 7.35–7.45. This range indicates a slightly alkaline environment necessary for optimal cellular processes and enzyme activity.

• 7.0–7.2: This range is lower than the normal and may indicate acidemia.
• 7.35–7.45: Correct range that reflects the normal physiological pH of arterial blood.
• 7.5–7.6: This range is higher than normal and may suggest alkalemia.
• 6.8–7.0: Such low pH levels are typically associated with severe acidemia and are not sustainable for life.