The best stimulator of respiratory center is____________?
Correct answer: B. Increase in arterial carbon dioxide level
- A. Decrease in arterial carbon dioxide level
- B. Increase in arterial carbon dioxide level
- C. Increase in arterial oxygen level
- D. None of the above
Explanation
An increase in arterial CO₂ raises hydrogen ion concentration in brain extracellular fluid and strongly stimulates the medullary respiratory centres. Low CO₂ and high O₂ do not provide the normal primary drive to ventilation.
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