Which of the following statements regarding the medulla oblongata is correct?
A. The medulla reduces the rate and depth of breathing if it detects an increase in carbon dioxide levels.
B. The medulla's primary role is to increase the body's level of oxygen, not to decrease its level of carbon dioxide.
C. The medulla is a portion of the cerebrum and primarily responds to an increase in the pH of cerebrospinal fluid.
D. The medulla is sensitive to pH changes and sends messages via the phrenic nerve to contract the diaphragm.
Answer: D. The medulla is sensitive to pH changes and sends messages via the phrenic nerve to contract the diaphragm.
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