What is the pH value of human blood?

The correct answer is option 2. 7.4.

The pH value of human blood is nearly 7.4. Human blood is slightly basic, with a pH value that is maintained within a narrow range of around 7.4. This slightly alkaline pH is crucial for maintaining various physiological processes in the body, including enzyme function, oxygen transport, and buffering of acids and bases. Any significant deviation from this pH range can lead to health issues or even be life-threatening.