Which blood level normally provides the primary stimulus for breathing?
A) pH
B) Oxygen
C) Bicarbonate
D) Carbon dioxide

Question

Quizplus · Accepted Answer

Carbon dioxide levels in the blood, measured by partial pressure of carbon dioxide (PCO2), provide the primary stimulus for breathing. When PCO2 levels rise, the brain responds by increasing the respiratory rate to exhale more CO2 and bring levels back to normal.

Which Blood Level Normally Provides the Primary Stimulus for Breathing