Physiology Which of the following is true for tracheobronchial luminal neuroendocrine cells? A Contain serotonin B Contain catecholamines C Respond to decrease in pO2 D Have only cholinergic nerve supply 💡 Explanation Which of the following is true for tracheobronchial luminal neuroendocrine cells? ✓ Correct Answer: A. Contain serotonin