What is the likely scenario triggering breathing in humans?

Question

Quizplus · Accepted Answer

High blood pO2 levels can trigger breathing in humans. When the oxygen levels in the bloodstream are high, the respiratory center in the brainstem is inhibited, allowing breathing to continue. However, when the oxygen levels drop, the respiratory center is stimulated, leading to an increase in breathing rate and depth. Low blood pCO2 levels alone are not a likely trigger for breathing in humans, as our bodies have mechanisms to maintain appropriate levels of carbon dioxide in the blood.

What Is the Likely Scenario Triggering Breathing in Humans