Blood carbon dioxide levels determine the pH of other body …

Biology Breathing and Exchange of Gases Disorder of Respiratory System and Regulation of Respiration Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 14, 2026

Blood carbon dioxide levels determine the pH of other body fluids as well as blood, including the pH

of cerebrospinal fluid. How does this enable the organism to control breathing?

The brain directly measures and monitors carbon dioxide and causes breathing changes accordingly

The medulla, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing

The brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide

Stretch receptors in the lungs cause the medulla to speed up or slow breathing

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