AIIMS May 2011 – MCQ 158
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!
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34 Comments
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 co2
increase in pco2
increase in H+
increase in pCO2
Ans is increase in H+ because co2 does not penetrate blood brain barrier.increased pco2 increases H2CO3 conc which disassociates into H+ and HCO3- ,thus so formed H+ penetrates blood brain barrier and stimulates respiratory centre.
increase in pco2
Z Ans is D!
pco2 increase
Increase in PCO2
D)H+
D. Increase in H+