AIIMS May 2011 – MCQ 158
12 May 2011
25 Comments
Primary stimulus for respiratory center is?
A. Increase in PCO2
B. Decrease in PCO2
C. Decrease in PO2
D. Increase in H+
Please contribute to the discussion by posting the answer with references and pointing out any errors in the question!

AIIMS May 2011 – MCQ 47
increase in pco2 [ganong]
ans:-d increase in H+
increase in H+
ans ia A increase in Pco2 is primary stumulus for respiratory centre. it cross BBB and there by results increase in H+ ions in the CSF which stimlates the respiratory center. Ans would hv been “D” if would have been asked that what is the primary stimulus for RS in CSF.
increase in H ions
increase in pco2
its increase in pco2
increase in H+ ions
H+
Its pco2
co2 has little role in stimulation of RS centre. bt H+ which is formed 4m co2 has direct stimulatory effect RS centre
here answer is increase in co2
if u has said direct stimulus… then ans will be increrase in H
co2
Pco2
Increase pco2
increase in pco2
a corect ans
Increased Pco2
decreased pco2
option A Increase in PCO2
increase in pco2
increase in pco2
I think its h+. Because pco2 does nothing on the R.S. The stimuli for r.s is h+
increase in pco2
increase in po2
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