The most significant factor in determining changes in the rate and depth of breathing is the blood concentration of oxygen.

Question

Quizplus · Accepted Answer

The most significant factor in determining changes in the rate and depth of breathing is actually the blood concentration of carbon dioxide (CO2), not oxygen. The body closely monitors CO2 levels through chemoreceptors, and increases in CO2 concentration stimulate an increase in breathing rate and depth to expel more CO2.

The Most Significant Factor in Determining Changes in the Rate