When you hold your breath, which of the following blood gas changes leads initially to the urge to breathe again?

Question

Quizplus · Accepted Answer

The urge to breathe again is triggered by rising carbon dioxide levels in the blood, not falling oxygen levels. When we hold our breath, carbon dioxide builds up in the blood, leading to an increase in acidity. This increase in acidity stimulates chemoreceptors in the brain that signal the respiratory muscles to contract, leading to the urge to breathe again.

When You Hold Your Breath, Which of the Following Blood