Which of the following statements regarding respiratory rate is not true?
A) When carbon dioxide levels rise, we breathe more rapidly to expel the excess.
B) Respiratory rate is regulated by the level of carbon dioxide in the blood.
C) When carbon dioxide levels fall, we breathe more rapidly to bring in more.
D) Medical conditions like pneumonia or brain injury will affect respiratory rate.
C
Explanation: When carbon dioxide levels fall, we breathe more slowly in order to retain carbon dioxide and raise blood levels. The other statements are true.
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