In which of the following conditions are the | vedclass

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(B) The respiratory rhythm center in the medulla region of the brain is primarily responsible for the regulation of respiration.Chemosensitive areas s

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Increase in $CO_2$ concentration in the artery

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(B) The respiratory rhythm center in the medulla region of the brain is primarily responsible for the regulation of respiration.Chemosensitive areas situated adjacent to the rhythm center are highly sensitive to $CO_2$ and hydrogen ions.An increase in the concentration of $CO_2$ and hydrogen ions in the blood activates these chemoreceptors,which in turn signal the rhythm center to make necessary adjustments in the respiratory process to eliminate these substances.Therefore,an increase in $CO_2$ concentration in the arterial blood is the primary stimulus for the respiratory centers.

In which of the following conditions are the respiratory centers stimulated?

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