pH of blood is

The normal pH level of human arterial blood is slightly basic (alkaline), typically ranging between 7.35 and 7.45. The average value is generally accepted as 7.40. Maintaining this narrow range is critical for normal physiological functions and enzyme activities. Significant deviations from this range can lead to life-threatening conditions: acidosis (if pH drops below 7.35) or alkalosis (if pH rises above 7.45). The body maintains this homeostatic balance using buffer systems (like the bicarbonate buffer), the respiratory system (by exhaling CO₂), and the renal system (by excreting or reabsorbing H⁺ and bicarbonate ions).