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

Normal arterial blood pH is tightly regulated between 7.35 and 7.45. This balance is maintained by buffer systems (bicarbonate), respiratory regulation (CO\(_2\) exhalation), and renal excretion of hydrogen ions. Values below 7.35 indicate acidosis; values above 7.45 indicate alkalosis.