In a healthy adult, what is the normal arterial blood pH range?

• A. 6.80–7.00
• B. 7.00–7.20
• C. 7.35–7.45
• D. 7.50–7.70

Answer: (C)

Verified step by step guidance

1. Understand that arterial blood pH is a measure of the acidity or alkalinity of the blood, which is tightly regulated to maintain homeostasis.
2. Recall that the normal pH range for arterial blood in a healthy adult is slightly alkaline, reflecting the balance between acids and bases in the body.
3. Recognize that values below the normal range indicate acidosis (excess acidity), and values above indicate alkalosis (excess alkalinity).
4. Identify the typical normal arterial blood pH range as between 7.35 and 7.45, which is essential for proper cellular function and enzyme activity.
5. Compare the given options and select the range that matches this normal physiological pH range, which is 7.35–7.45.