Statement A: Pneumotaxic centre is located in the medulla oblongata
Statement B: Pneumotaxic centre moderates the functions of rhythm centre, because it is sensitive to changes in the concentration of O₂ and hydrogen ions.

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(A) is true but (B) is false

(A) is false but (B) is true

Both (A) and (B) are false

Both (A) and (B) are true

answer is C.

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Detailed Solution

Pneumotaxic centre is located in the pons. Pneumotaxic centre by itself is not sensitive to changes in the concentration of O₂ and hydrogen ions. A chemosensitive area adjacent to respiratory rhythm centre is sensitive to CO₂ and hydrogen ions. Only peripheral chemoreceptors (carotid bodies and arotic bodies) are sensitive to changes in pO₂.

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