AEMCA Practice Exam

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What is the normal blood pH range in humans?

6.8-7.2
7.0-7.5
7.35-7.45
7.5-8.0

The correct answer is: 7.35-7.45

The normal blood pH range in humans is critically important for various physiological processes, as it reflects the balance between acidity and alkalinity in the body. The range of 7.35 to 7.45 is considered normal for arterial blood, indicating that the blood must maintain a slightly alkaline environment to function optimally. Within this range, several biological systems, including enzyme activity and oxygen transport, operate effectively. Deviations from this pH range can lead to disturbances such as acidosis (lower than 7.35) or alkalosis (higher than 7.45), which can have significant physiological consequences. Understanding this pH range is essential for healthcare professionals to assess and manage patients' metabolic and respiratory conditions appropriately. Other ranges mentioned do not represent the normal physiological state of human blood. For instance, the pH levels suggested in the other options are not compatible with life due to the increased risk of severe metabolic disturbances.