The most important signal that the brain uses to set the breathing rate is the level of blood:

Name: The most important signal that the brain uses to set the breathing rate is the level of blood:
Brand: Quizplus
Rating: 4.7 (57 reviews)

Question

Quizplus · Accepted Answer

The level of carbon dioxide in the blood is the main signal that triggers the brain to regulate breathing rate. When carbon dioxide levels increase, the brain signals for an increase in breathing rate to remove the excess CO2 and maintain proper blood pH levels.

The Most Important Signal That the Brain Uses to Set