Question:
What is the normal pH range of human blood?
What is the normal pH range of human blood?
Show Hint
Blood is slightly alkaline and kept in a very narrow window by buffers.
Updated On: Oct 1, 2026
- \(6.0\) to \(6.4\)
- \(7.36\) to \(7.42\)
- \(6.4\) to \(6.95\)
- \(7.8\) to \(8.0\)
Show Solution
Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Blood is a buffered fluid. Its pH is held in a very narrow window because even small changes disturb enzymes and oxygen transport.
Step 2: Key Fact:
The normal pH range of human blood is 7.36 to 7.42, so blood is slightly alkaline. The bicarbonate-carbonic acid buffer, \(\text{HCO}_3^- / \text{H}_2\text{CO}_3\), together with haemoglobin and phosphates, maintains this value.
Step 3: Detailed Explanation:
A pH above 7 means the solution is basic, and 7.36-7.42 is just above neutral. If blood pH falls below about 7.35 the condition is called acidosis, and if it rises above about 7.45 it is called alkalosis. Both are harmful.
Step 4: Why the other options are wrong.
Ranges 6.0-6.4 (A) and 6.4-6.95 (C) are acidic and would be fatal for blood. The range 7.8-8.0 (D) is much too alkaline for normal blood. Only 7.36-7.42 is the accepted value.
Final Answer:
The normal blood pH range is \(7.36\) to \(7.42\), option (B). \[ \boxed{7.36 \text{ to } 7.42} \]
Blood is a buffered fluid. Its pH is held in a very narrow window because even small changes disturb enzymes and oxygen transport.
Step 2: Key Fact:
The normal pH range of human blood is 7.36 to 7.42, so blood is slightly alkaline. The bicarbonate-carbonic acid buffer, \(\text{HCO}_3^- / \text{H}_2\text{CO}_3\), together with haemoglobin and phosphates, maintains this value.
Step 3: Detailed Explanation:
A pH above 7 means the solution is basic, and 7.36-7.42 is just above neutral. If blood pH falls below about 7.35 the condition is called acidosis, and if it rises above about 7.45 it is called alkalosis. Both are harmful.
Step 4: Why the other options are wrong.
Ranges 6.0-6.4 (A) and 6.4-6.95 (C) are acidic and would be fatal for blood. The range 7.8-8.0 (D) is much too alkaline for normal blood. Only 7.36-7.42 is the accepted value.
Final Answer:
The normal blood pH range is \(7.36\) to \(7.42\), option (B). \[ \boxed{7.36 \text{ to } 7.42} \]
Was this answer helpful?
0
0
Top MHT CET Chemistry Questions
- The temperature of $32^{\circ}C$ is equivalent to
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
- If a metal crystallises in bcc structure with edge length of unit cell $4.29 \times 10^{-8}\, cm$ the radius of metal atom is
- Which of the following oxides can act both as an oxidising agent as well as reducing agent ?
- "The mass and energy both are conserved in an isolated system", is the statement of
View More Questions
Top MHT CET Human health and disease Questions
Top MHT CET Questions
- During r- DNA technology, which one of the following enzymes is used for cleaving DNA molecule ?
- In non uniform circular motion, the ratio of tangential to radial acceleration is (r = radius of circle, $v =$ speed of the particle, $\alpha =$ angular acceleration)
- The temperature of $32^{\circ}C$ is equivalent to
- The line $5x + y - 1 = 0$ coincides with one of the lines given by $5x^2 + xy - kx - 2y + 2 = 0 $ then the value of k is
- The heat of formation of water is $ 260\, kJ $ . How much $ H_2O $ is decomposed by $ 130\, kJ $ of heat ?
View More Questions