gas regulation

Question 1

what is the feedback loop in response to low oxygen levels?

Answer 1

stimulus = low oxygen levels 
receptor = peripheral chemoreceptors in the aorta and carotid artery
modulator = respiratory center in the medulla oblongata 
effectors = respiratory muscles (diagram and intercostals)
response = increased rate of contraction and relaxation of intercostals and diagram to increase breathing rate and blood oxygen levels
feedback = increase in oxygen conc in blood plasma

Question 2

what is the feedback loop in response to high carbon dioxide levels?

Answer 2

stimulus = high carbon dioxide levels 
receptor = peripheral chemoreceptors in the aorta and carotid artery + central chemoreceptors in medulla oblongata
modulator = respiratory center in the medulla oblongata 
effectors = respiratory muscles (diagram and intercostals)
response = increased rate of contraction and relaxation of intercostals and diagram to increase breathing rate and blood oxygen levels
feedback = decrease in CO2 conc in blood plasma

Question 3

what is the feedback loop in response to low pH levels?

Answer 3

stimulus = low ph levels 
receptor = peripheral chemoreceptors in the aortic bodies and carotid bodies 
modulator = respiratory center in the medulla oblongata 
effectors = respiratory muscles (diagram and intercostals)
response = increased rate of contraction and relaxation of intercostals and diagram to increase breathing rate and blood oxygen levels
feedback = increase in pH in blood plasma