Question:
What is the normal pH of human blood?
What is the normal pH of human blood?
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Blood is slightly basic and kept at about 7.35 to 7.45 by the bicarbonate buffer.
Updated On: Oct 1, 2026
- \(7.0\)
- \(6.9\)
- \(7.4\)
- \(8.1\)
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Human blood must keep a nearly constant pH, because enzymes and cells work only in a narrow range. A buffer system in blood (mainly carbonic acid and bicarbonate) holds the pH steady.
Step 2: Recall the fact:
The normal pH of human blood is in the range 7.35 to 7.45, so its standard value is taken as 7.4. It is slightly basic.
Step 3: Why the other options are wrong.
A pH of 7.0 is neutral water. A pH of 6.9 is slightly acidic, which indicates a dangerous condition called acidosis if the blood falls to that level. A pH of 8.1 is too basic (alkalosis) and is not normal.
Final Answer:
The normal pH of human blood is 7.4. \[ \boxed{\text{(C) }7.4} \]
Human blood must keep a nearly constant pH, because enzymes and cells work only in a narrow range. A buffer system in blood (mainly carbonic acid and bicarbonate) holds the pH steady.
Step 2: Recall the fact:
The normal pH of human blood is in the range 7.35 to 7.45, so its standard value is taken as 7.4. It is slightly basic.
Step 3: Why the other options are wrong.
A pH of 7.0 is neutral water. A pH of 6.9 is slightly acidic, which indicates a dangerous condition called acidosis if the blood falls to that level. A pH of 8.1 is too basic (alkalosis) and is not normal.
Final Answer:
The normal pH of human blood is 7.4. \[ \boxed{\text{(C) }7.4} \]
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