Normal blood pH range is:

Normal blood pH range is:

• A. 7.35-7.45
• B. 7.25-7.35
• C. 7.40-7.50
• D. 7.20-7.30

Answer: (A)

Maintaining a precise blood pH is essential because even small shifts alter enzyme activity and many cellular processes. The normal arterial blood pH sits in a narrow window around 7.35 to 7.45, reflecting the balance between carbon dioxide and bicarbonate managed by the respiratory and renal buffering systems. Values below 7.35 indicate acidemia, while values above 7.45 indicate alkalemia; both signify disruption of homeostasis. The range 7.35–7.45 best represents the typical normal state, whereas the other options fall outside this physiologic window, indicating mild to moderate acidemia or alkalemia depending on the end.

Maintaining a precise blood pH is essential because even small shifts alter enzyme activity and many cellular processes. The normal arterial blood pH sits in a narrow window around 7.35 to 7.45, reflecting the balance between carbon dioxide and bicarbonate managed by the respiratory and renal buffering systems. Values below 7.35 indicate acidemia, while values above 7.45 indicate alkalemia; both signify disruption of homeostasis. The range 7.35–7.45 best represents the typical normal state, whereas the other options fall outside this physiologic window, indicating mild to moderate acidemia or alkalemia depending on the end.