During most daily activities, the human respiration rate is most closely linked to the blood levels of
A) nitric acid.
B) nitrogen.
C) oxygen.
D) carbon dioxide.
E) carbon monoxide.

Question

Quizplus · Accepted Answer

The human respiration rate is primarily controlled by the concentration of carbon dioxide in the blood. When CO2 levels rise, the brain signals the respiratory muscles to increase ventilation and expel the excess CO2. In contrast, when CO2 levels fall, the brain signals the respiratory muscles to slow down and retain more CO2. Oxygen levels can also play a role in respiration, but they are not the primary driver of the breathing rate.

During Most Daily Activities, the Human Respiration Rate Is Most