Surgery A 40-year-old woman is suspected of having a carotid body tumor. Which one of the following is most characteristic of such a tumor?Carotid body tumor A They secrete catecholamines. B They are more common at sea level. C They arise from structures that respond to changes in blood volume. D They arise from the structures that respond to changes in PO2. 💡 Explanation A 40-year-old woman is suspected of having a carotid body tumor. Which one of the following is most characteristic of such a tumor?Carotid body tumor ✓ Correct Answer: D. They arise from the structures that respond to changes in PO2.