The primary respiratory center is directly sensitive to _____ in the blood to modify respiration rate.
A)carbon dioxide and oxygen levels
B)hydrogen and oxygen levels
C)carbon dioxide and hydrogen levels
D)only oxygen levels

Question

Quizplus · Accepted Answer

The primary respiratory center in the medulla oblongata is directly sensitive to the levels of carbon dioxide and hydrogen ions (pH) in the blood. When these levels increase, it stimulates the respiratory center to increase the rate and depth of breathing to remove excess carbon dioxide and return the pH to a normal range. Oxygen levels play a secondary role and are primarily detected by peripheral chemoreceptors in the carotid and aortic bodies.

The Primary Respiratory Center Is Directly Sensitive to _____ in the Blood