When you hold your breath, which changes in one or more blood gases leads initially to the urge to breathe again?
A)rising carbon monoxide level
B)rising carbon dioxide level
C)falling carbon monoxide level
D)rising carbon dioxide level and falling carbon monoxide level

Question

Quizplus · Accepted Answer

The urge to breathe is primarily triggered by rising levels of carbon dioxide in the blood, which is detected by chemoreceptors.

When You Hold Your Breath, Which Changes in One or More