Chemistry Equilibrium NUMS 2022
PMDC Verified Question 65 of 102
The pH of human blood is:
A
7.35 to 7.45
B
6.35 to 7.45
C
8.35 to 8.45
D
5.57 to 6.57
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: 7.35 to 7.45
Concept:

Human blood operates as a natural buffer system to maintain physiological homeostasis, strictly regulating its acid-base balance.

Formula:

$$ \text{Normal Blood pH} \approx 7.4 $$

Solution:

  • The optimal blood pH for enzyme function and oxygen transport is tightly controlled between 7.35 and 7.45.


  • This slightly alkaline state is maintained primarily by the carbonic acid-bicarbonate (\( \text{H}_2\text{CO}_3 / \text{HCO}_3^- \)) buffer system.


Why other options are incorrect:

A pH below 7.35 causes acidosis, and above 7.45 causes alkalosis, both of which are extremely dangerous. The other ranges are physically fatal for human survival.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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