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?

Question

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? (A) The brain directly measures and monitors carbon dioxide and causes breathing changes accordingly. (B) The medulla, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing (C) The brain alters the pH of the cerebrospinal fluid to force the animal to retain more or less carbon dioxide (D) Stretch receptors in the lungs cause the medulla to speed up or slow breathing

Tardigrade Admin · Accepted Answer

Correct answer is (b) The medulla, which is in contact with cerebrospinal fluid, monitors pH and uses this measure to control breathing

Q. Blood carbon dioxide levels determine the $p H$ of other body fluids as well as blood, including the $p H$ 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 $p H$ and uses this measure to control breathing

The brain alters the $p H$ 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

Correct answer is (b) The medulla, which is in contact with cerebrospinal fluid, monitors $p H$ and uses this measure to control breathing

Q. 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?