UPSC NDA I 2024 General Ability Paper

Concept:The human body functions optimally within a specific pH range to maintain homeostasis.Explanation:The overall pH range for the human body is approximately $7.0$ to $7.8$.Normal blood pH is tightly regulated between $7.35$ and $7.45$, which lies within this broader range.Different parts of the body have varying pH levels; for example, the stomach is highly acidic ($pH$ $1.5$–$3.5$) for digestion.However, the question refers to the general pH range of the entire body.Buffer systems such as bicarbonate, phosphate, and proteins help maintain this pH balance.Enzyme activity and biochemical reactions depend heavily on this stable pH environment.Answer:Option B: $7.0 - 7.8$