Chemistry Equilibrium MDCAT 2016
PMDC Verified Question 88 of 102
Human blood maintains its pH between:
A
6.50 \( - \) 7.00
B
7.50 \( - \) 7.55
C
7.20 \( - \) 7.25
D
7.35 \( - \) 7.40
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 7.35 \( - \) 7.40
Concept:

Human blood operates as a natural buffer system to maintain physiological homeostasis.

Formula:

$$ \text{Normal Blood pH} = 7.35 \text{ to } 7.40 $$

Solution:

  • The optimal blood pH for enzyme function and oxygen transport is strictly regulated between 7.35 and 7.40.


  • This slightly alkaline state is maintained primarily by the carbonic acid-bicarbonate buffer system.


Why other options are incorrect:

A pH below 7.35 causes acidosis, and above 7.45 causes alkalosis, both of which can be fatal. The other ranges are physically dangerous 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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