The alinear rise in ventilation observed during incremental exercise (i.e., ventilatory threshold) is thought to be principally due to A) a decrease in arterial PO₂. B) an increase in arterial PCO₂. C) an increase in arterial pH. D) a decrease in arterial pH.

Question

Quizplus · Accepted Answer

The ventilatory threshold is associated with an increase in lactate production, which leads to a decrease in arterial pH (acidosis). This acidosis stimulates chemoreceptors, increasing ventilation to expel CO2 and compensate for the drop in pH.

The Alinear Rise in Ventilation Observed During Incremental Exercise (I