What is the primary regulator of the magnitude of ventilation in normal circumstances
A) the H⁺ concentration of the brain extracellular fluid, which is monitored by central chemoreceptors
B) the PO₂ of the arterial blood, which is monitored by central chemoreceptors
C) the PO₂ of the arterial blood, which is monitored by peripheral chemoreceptors
D) the PCO₂ of the arterial blood, which is monitored by central chemoreceptors
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