What is the normal pH range of blood in the human body?

The normal pH range of blood in the human body is crucial for maintaining proper physiological functions and homeostasis. A blood pH of 7.35 to 7.45 is considered the optimal range, with values below this indicating acidosis and values above suggesting alkalosis. Maintaining this narrow pH range is essential because even slight deviations can have significant consequences on enzyme activity, oxygen transport, and metabolic processes. The body employs various mechanisms, such as buffer systems, respiratory regulation, and renal adjustments, to closely regulate blood pH within this range, ensuring that biological functions proceed normally.

Given this context, other options present pH ranges that fall outside of the established normal range, which could lead to various health issues. For instance, a pH below 7.35 indicates a more acidic environment, while a pH above 7.45 suggests alkalinity. Therefore, option C accurately reflects the physiological normality of blood pH in humans.