PhysioEx 8. Exercise 7 Activity 5--- Plz Help

Exercise 7, Activity 5
Exploring Various Breathing patterns

1.)What happens to Pco2 during rapid breathing? Explain your answer
2.) What happens to Pco2 during the entire time of the rebreathing activity?
3.) Did the depth of the breathing pattern change during re-breathing? (Carefully examine the tracing for rate and depth changes; the changes can be subtle.) Explain your observations
4.) What happened to the Pco2 during breath holding?
5.) What happened to the breathing pattern when normal respiration resume?

Please help! Thanks guys