With regard to the respiratory centre, which of the following is TRUE? A. Blood oxygen concentration affects the respiratory centre. B. Anaesthetics don’t affect respiration. C. Raised intracranial pressure increases ventilation. D. Narcotic drugs may depress ventilation
Option D. Anaesthesia or narcotics (e.g. morphine) can depress breathing centres (which decreases ventilation). As can raised intracranial pressure. It is CO 2 concentration instead of O 2 concentration that impacts the respiration cen- tre of the brain.
