What is the normal pH range of human blood?

The normal pH range of human blood is essential for maintaining physiological homeostasis, as it is tightly regulated by various mechanisms in the body, including the respiratory and renal systems. The correct range is typically between 7.35 and 7.45, with an average of around 7.40. This pH range is critical for optimal enzyme activity and metabolic processes.

Levels below this range can indicate acidosis, while levels above can suggest alkalosis, both of which can have significant physiological effects. The choice indicating 7.34-7.44 correctly encompasses the lower and upper thresholds of this normal range, recognizing that there can be slight variations based on individual factors and the context of physiological or pathological states.

Other ranges provided do not align with the established normal values, with one indicating a predominantly acidic condition, which would be abnormal, and others suggesting either more extreme variations from the normal physiological state or are outside the accepted limits for healthy human blood pH. This understanding of blood pH is crucial for clinical practice, especially in assessing acid-base disturbances in various health conditions.