Physiology Concerning the ventilatory response to hypoxia, TRUE is: A It is the major stimulus to ventilation at high altitude B It is primarily brought about by the central chemoreceptors C It is reduced if the PCO2 is also raised D It rarely stimulates ventilation in patients with chronic lung disease 💡 Explanation Concerning the ventilatory response to hypoxia, TRUE is: ✓ Correct Answer: A. It is the major stimulus to ventilation at high altitude