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Q99
(NDA-I/2024)
Science & Technology › Basic Science (Physics, Chemistry, Biology)
Official Key
Human body works in the pH range of :
Explanation
The correct answer is Option B (7.0 - 7.8). According to biological standards and NCERT Science textbooks, the human body functions within a narrow pH range of 7.0 to 7.8.
- Blood pH: Human arterial blood is slightly alkaline, strictly maintained between 7.35 and 7.45.
- Homeostasis: The body uses complex buffering systems, such as the bicarbonate-carbonic acid system, to keep the pH within this vital range.
- Physiological Impact: Living organisms are highly sensitive to pH changes. If the body's pH falls below 7.0 (acidosis) or rises above 7.8 (alkalosis), it can lead to severe metabolic disturbances, as enzymes and cellular processes require this specific alkaline environment to function optimally.
- Variations: While specific fluids like gastric juice (pH ~1.5-3.5) are highly acidic, the overall systemic environment must remain within the 7.0-7.8 range for survival.
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