This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 3, Subject name: Physiology
True regarding peripheral chemoreceptor 
Select and explain. 
A. Sensitive to hypoxia, B. Sensitive to central PCO2, C. Sensitive to pH, D. None of the above
A: Sensitive to hypoxia
Answer: A: Sensitive to hypoxia 
Explanation: Peripheral chemoreceptor It responds strongly to decrease O2 in blood. Increase Co2 or aerial H+ ions indirectly stimulates peripheral chemoreceptors, increasing respiratory activity.