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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!

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25 Comments »

  • venkatesh said:

    increase in pco2 [ganong]

  • pratik said:

    ans:-d increase in H+

  • harick said:

    increase in H+

  • lucky verma said:

    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.

  • suparna said:

    increase in H ions

  • aditya said:

    increase in pco2

  • ankit said:

    its increase in pco2

  • Devesh said:

    increase in H+ ions

  • ajoy saha said:

    H+

  • Aarti said:

    Its pco2

  • khalil said:

    co2 has little role in stimulation of RS centre. bt H+ which is formed 4m co2 has direct stimulatory effect RS centre

  • KraZZyDoC said:

    here answer is increase in co2
    if u has said direct stimulus… then ans will be increrase in H

  • prabakaran said:

    co2

  • Swarna mukul said:

    Pco2

  • suren said:

    Increase pco2

  • hiren said:

    increase in pco2

  • drmurli said:

    a corect ans

  • Nani Gopal Das,RIMS Imphal said:

    Increased Pco2

  • ranjit biswas said:

    decreased pco2

  • krishno biswas said:

    option A Increase in PCO2

  • sadeesh kumar said:

    increase in pco2

  • Amrita said:

    increase in pco2

  • arun said:

    I think its h+. Because pco2 does nothing on the R.S. The stimuli for r.s is h+

  • hari said:

    increase in pco2

  • tabia mir said:

    increase in po2

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