Chemoreceptors located in the carotid bodies and aortic arch sense minute changes in the ______ and send signals to the respiratory centers via the _______________ nerves.
A) PaO2, vagus and intercostal
B) PaCO2, glossopharyngeal and vagus
C) PaCO2, phrenic and glossopharyngeal
D) PaO2, hypoglossal, vagus, and intercostal
Answer: B) PaCO2, glossopharyngeal and vagus
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