What is the normal range for blood pH?

• A. 6.35 - 6.45
• B. 7.25 - 7.35
• C. 7.35 - 7.45
• D. 8.0 - 8.5

Answer: (C)

The normal range for blood pH is indeed 7.35 to 7.45. This range is considered essential for homeostasis in the human body, as even slight deviations from this range can lead to significant physiological effects. A pH lower than 7.35 indicates acidosis, which can impair cellular functions and lead to a variety of health issues, while a pH higher than 7.45 indicates alkalosis, which can also disrupt metabolic processes.

The body's buffering systems, including bicarbonate, proteins, and phosphate, work continuously to maintain blood pH within this narrow range, responding to changes in carbon dioxide levels and metabolic acids. Therefore, understanding that the normal blood pH range is 7.35 to 7.45 is fundamental for identifying acid-base disturbances and their implications for patient health.