Human body works in the pH range of:

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6.8 - 7.2

7.0 - 7.8

6.5 - 7.5

7.5 - 8.0

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UPSC NDA-1 – 2024

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The human body, particularly blood, maintains a very narrow pH range for proper functioning.

The normal pH range of human blood is slightly alkaline, typically between 7.35 and 7.45. Among the given options, the range of 7.0 – 7.8 is the one that correctly encompasses the typical physiological pH range.

Significant deviations from this narrow pH range can lead to severe health problems. For example, a pH below 7.35 is called acidosis, and a pH above 7.45 is called alkalosis. The body uses buffer systems (like the bicarbonate buffer system) to maintain this delicate pH balance.

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